These are great, I have 3 that are keyed-a-like and have just ordered another. They are very good quality and I know from my own research that they are near impossible to defeat. I matched mine with a 16mm Protector chain, all connected to a ground anchor to give good solution for all 3 of my bikes with no obvious weak point. Steve and his brother couldn't be more helpful - nice to spend money with a quality, small British firm.

Good enough for the LockPickingLawyer so good enough for me. Nice solid weight and easy to use. Supplied with three keys which is great.

I have a Vespa Primavera and commute into London daily. This D lock had excellent reviews elsewhere and I agree. It’s tough, easy to use and fits through the front wheel and fork nicely. I bought this instead of a disc lock. The weight is reassuring and I ride with it under the seat without issue. Service, packing and delivery were excellent. Thanks.

Great build quality and fits under my seat for portability. Very happy!

Very solid and substantial D-lock 130mm with 16mm hardened steel shackle. Very handy size to carry on my motorcycle it’s really easy to fit and remove, making it a great choice for anyone who makes a lot of stops while out and about. Great product and absolute brilliant service...

Ordered the 19mm version, didn't feel as as heavy as I'd feared. Feels very nice to hold, really looking forward to locking my bicycle with it now! Did lots of research and wanted a serious but portable D-Lock.

Excellent service from Security for bikes. Very helpful and friendly.

Product delivery was quick and on time. DPD are their delivery company and have great online tracking systems.

The lock itself is well made and very robust. Excellent price when compared to the other reputable lock companies, Abus & Kryptonite.

Nice piece of quality kit - solid but portable, extra length gives more security options


Great company to deal with - know their stuff

The D lock is a fantastic addition to a chain and round lock set up. It gives you so many options to secure your bike. It’s very flexible in its uses and is very portable. Many thanks to David for helping me to select exactly what I needed to provide the best security possible.

Great that you can order different sized shackles, making it very versatile. A bargain when you see how much other 'name' brands charge you, for an inferior product.
Excellent customer service, and fast delivery.

Appears to be good quality at a good price.
I bought the 130mm to go around the frame spar of an enduro bike then a 16mm chain down to a ground anchor as there was not enough clearance for the chain to go around the frame direct.

Bought the 190mm to lock through my front discs on a Moto Guzzi V85TT with spokes and large centre hub. Couldnt get the roundlock to fit the disc but this u bolt fits through both discs and spokes neatly. Can also add my 16mm chain if needed. Great versatility and value for money.

I have purchased three of the locks and they are perfect, well made, study and easy to use. The "130" will fit in the swing arm of a 2021 Triumph Tiger GT Pro 900, the swing arm of a Suzuki GSXR1000 and the frame/rear sub frame of a 2018 Norton Commando 961 (and the latest TVS versions). Great service as usual from these guys.

Great bit of kit, went for the 30mm as it allows me to tether to something that I can get the bike close to whilst on my travels. Go through the wheel amp some frame too. Also can stick the business end out of my cover just to deter any tea leaves having a think it may be less than protected.

T DIB D lock is very sturdy, it is also quite heavy but that is good. The red finish of the body stands out well. The locking mechanism seems to work very well.

Absolutely brilliant, I bought two for added security for my bike.I got the smaller version which fits perfectly as a disc lock through the rear wheel of my bike,I also bought a RoundLock padlock which is also excellent for the money, it can be used as a smaller portable disc lock ( make sure it will fit your disc first) or with the chain , highly recommended.

Bought DIB D-Lock with Protector 13mm chain and Shed Door Beef-up kit. Just waiting for delivery of Shed Shackle to complete the package. The products are real solid security kit and worth paying for quality for peace of mind. The service provided by the company is superb, happily offering great advice and updates on status of my order.
The videos and links give so much useful guidance to help make purchasing choice for a secure setup.

Solid reassuring D lock. I used these on my scooter to secure both wheels through front and rear forks using two different lengths.

Lock seems very sturdy and suits our purpose well. It arrived well packed and exceedingly promptly, with great customer service (detailed shipping info) from Pragmasis.

Excellent sturdy feeling lock. Fits well following good advice from customer service before ordering. The customer service were very helpful in changing a previous lock I bought for this one and very fast and responsive. 5 stars in my view!

This came super quickly and seems exceedingly study, they were more than happy to make the keys for both match. Very happy with it.

Bought this to attach to ground anchour. Lock is well made and sturdy. The D part seems to be thicker than most other dlocks I've seen.

Used to extend a chain from Torc Ground Anchor. Feels very strong easy to use

The lock itself is great, and I love the option of using different-length shackles according to the situation.

As a disabled user of a mobility scooter I needed a secure lock to match with my 16mm chain secured to a wall mounted anchor. The close shackle padlock I have been using was difficult for me to use as I have limited strength in my hands and lower arms and having to lift both ends of the chain to loop 1 link through another and then trying to fit and lock the padlock whilst fighting with the rubber flap was a nightmare.

This product has changed the situation completely. I now only need to use a single length of chain and I can easily attach this lock with the chain to a strut on the scooter. The fact that the shackle is also 16mm means there is no weak point in the system. I can highly recommend this lock to disabled users as it is much easier to handle than an equivalent padlock.

Finally great service - received the day after despatch and excellent communication.
[Pragmasis Comment: I am very glad you are finding this helps your situation. My father had only one hand, and Sarah, my (very sadly late) wife that setup Pragmasis with me had Cystic Fibrosis so I have a little experience of people dealing with issues that others might not even notie. If we can make life a little easier then we have achieved something. Thanks for bothering to say. Very much appreciated.]

Bought four of these (keyed alike) to secure my motorcycles to a Pragmasis ground anchor and chain and they are ideal. Reasonably portable too for use as a disc lock and have even used them to secure my more expensive bicycle on rides out. Delivery times were excellent and I am very pleased.

Just taken delivery of another Dib-D lock to secure my new lawn tractor. I have purchased many products from Pragmasis and I must admit that their service is superb and their products are first class! Many thanks

Couldn't be happier with the products and service. If I need anything else this company will be my first call. Thank you.

Following David's very helpful advice about securing several bicycles with one chain (apparently, thieves will cut the frame of the last bike so the remaining bikes are unprotected), I have bought D-Locks to fasten the bike rear-triangles directly to the chain.
As with my previous dealings with Pragmasis, I am so impressed with the level of service, advice and quality of the products. The locks incredibly solid (as are the chains & ground anchors). No bikes are leaving my garage without a considerable fight!

A great, strong U lock on its own and part of my solution to locking 3 bikes to a tree in London: 4 metres of Pragmasis 16mm chain goes round the tree (the chain threads through the extra-large loop at the end); then the U-lock locks the back wheel of the first bike to the chain; the middle (most expensive) bike has a Pragmasis anti-pinch pin through it's rear wheel tube, which a link of the chain goes over; it then goes through the rear wheel of the last bike and the end goes back to the anti-pinch pin. The Squire SC65 locks tightly on to the anti-pinch pin, holding both chain links in place. Very reassuring.