Protector 16mm uncroppable hardened boron steel chain (select length below), plus the super-compact RL21 RoundLock.

The chain is Sold Secure Motorcycle Gold (in fact, it is Sold Secure Gold in every category) and the RoundLock is Sold Secure Motorcycle Gold/Quad & ATV Gold/Bicycle Gold/Motor Scooter Gold approved. The chain is 4.5kg/metre; the RoundLock padlock is another 0.6kg. The chain is supplied with usually bronze colour sleeving, and the chain itself is finished with either zinc plating or a black finish.

3 keys supplied.

Keyed-alike available at initial order only (not available retrospectively) when ordering more than one lock together, and only amongst other RL21(A) locks and/or DIB-Series D-Locks. These locks can't be keyed-alike with any of the Squire locks. Please note that the Keyed Alike option must be selected for *all* locks in the set that you wish to be Keyed Alike.

The RoundLock is not suitable for our 19mm chain unless the optional extra RL21A socket is also purchased and that is used in place of the standard RL21 socket. The RL21A socket is available separately - Please Click for the RL21A Socket product listing.

The RoundLock can also sometimes be used as a motorcycle disc lock - Check that you have a suitable opening that will take the 21mm diameter shackle in your brake disc or disc carrier. You can then use this with a chain when at home and as a disc lock when out and about. Note that disc locks do not prevent a bike from being lifted into the back of a van, which is a common technique employed by thieves.

Noose chain option has a special oversize ring at one end of the chain (only), allowing a noose to be formed by looping the chain through that ring. This is helpful with longer lengths of chain, avoiding the normal need to make a big loop around all items - A noose can be formed at the ground anchor and a second loop formed with the lock at the other end of the chain.

Price and weight shown are for the package including a 2.0m long chain - Please select alternative lengths below and the price displayed will be adjusted automatically.

The Protector 16mm chain has the following link dimensions (nominal): 132 x 62-64mmmm outside; 100 x 30-32mm inside, throughout its length (an elongated end link is not required). It is constructed from 16mm diameter bar. The smallest rectangular hole it will fit through is about 65 x 34mm, but that would also be a tight fit. It is again fitted with a protective fabric sleeve, usually a bronze colour (adding about 4mm maximum to the width noted above).

Click for more technical info on the Protector range of security chains.

Click for more technical information on the RoundLock.

The following video gives an overview of the Protector 16mm chain (opens in a new window)

The next video gives a quick visual tour of the whole Protector range of chains, from the ultimate Protector Titan chains, through to the Protector 11mm (opens in a new window)

And this video shows how to fit the lock to the chain (with a non-Noose chain) (opens in a new window)

And this video explains Protector Noose chains option (opens in a new window)

And this video explains the SFB RoundLock, showing how it can be used with our Protector 16mm and 13mm chains and, with the optional RL21A socket, with the 19mm chains (opens in a new window)