Video: Pragmasis RoundLock product overview

Updated on May 21, 2025

Below is a short video overview of 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:

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1000s of customers trust Pragmasis

Established in 2003, we've built our business on quality, reliability and customer service.

James T

Great products

Thanks for some great products. Your kit protected my bikes perfectly during a burglary a few years ago and it’s still going (extremely) strong.

Ben R

Still going strong

I bought from you once and only needed to buy once in 2016, but suffice to say that the 19mm bespoke length chain, and ground anchor installed according to Pragmasis instructions are still going strong, keeping my bike safe just off the street in Brixton, London.

Mr B

Wholly impressed

I would like to say I am wholly impressed with the ground anchors, chains and padlocks that I have purchased over the past few years and will always recommend you when the opportunity arises.

C Rowe

Torc Ground Anchor

Excellent quality piece of kit. Our second anchor to date. Exceptional service. Nice to see a British company up there supplying quality goods and customer service

Steve

Top class service

This is a serious chain! I certainly feel more comfortable that my bikes are well secured. Very pleased with the service too. I phoned then placed an online order and my chain arrived the next day. Excellent product and 1st class service. Thank you!

We're here to help

If you have a question, please visit our in-depth knowledgebase. The knowledgebase answers which answers common questions and gives instructions on how best to choose, fit and use our products.

You will find almost every question we have been asked has been answered in our knowledgebase.

Our most frequently asked questions are listed on this page.

For any other questions you can email us on info -at- securityforbikes.com

We are a small team and we're usually busy sleeving chains, putting together fitting kits and packing up orders but we endeavour to reply to all enquiries within 48 hours.

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How long will it take to get my order?

We aim to process and dispatch orders within 1-3 working days. Most orders are delivered in the UK within 2-4 working days.

Can I track my order?

Yes you can. Throughout your order journey you'll be sent notifications by email. If you specify a mobile phone number you will also get a text message from the courier with an estimation of the time of delivery on the day prior to delivery.

What do you charge for delivery?

We subsidise all deliveries, so you only pay £3.95 standard delivery fee for UK orders under £100. Orders over £100 qualify for free delivery. This excludes Highlands & Islands. International deliveries are charged at varying rates.

What couriers do you use?

For UK shipments, we use DHL and Royal Mail. Both of these couriers have proven to be excellent; with superb first-attempt delivery rates and a simple system for the customer to re-schedule deliveries or select a safe place.

What payment methods do you accept?

We offer a wide range of payment methods, including by Credit or Debit Card, PayPal and Klarna, which allows you to pay in 3 installments.

Do you ship overseas?

We do not ship overseas but we do server overseas customers by sending their items to UK freight forwarding services. See our page on International Orders for more information.

Our Help Center includes answers to all of the questions we are asked.

Visit our Help Center