Oxford's Beast chain has chain links that are 22mm in diameter.

You can secure the Beast chain with a Pragmasis Roundlock, when the Roundlock RL21A adapter socket is fitted.

We created the RL21A socket to cater for 19mm and larger chains. The socket has a chamfered edge which gives it more clearance on larger chains.

The Oxford Beast 22mm chain's internal clearance is 35mm. The Roundlock body is 40mm and so has 2.5mm clearance over the chain, making it almost impossible to dislodge with common attack methods, including sledgehammers.