MTL300 Break Secure XP Euro Double Cylinder. This product comes with two keys and a plastic card which is the only way to get additional/replacement keys cut for your lock.
 
The variation of sizes denotes an 'A' on the 'attack' side; this is the exterior side of the cylinder as it will snap off if it is ever tampered with but still usable with your key.
 
This Mul-T-Lock rim cylinder on the brand new MTL300 platform offers a high-class locking product, coupled with sustainability, and a patented security process to assure your security is upheld. This Break Secure XP version offers a higher standard of security against any attack and is tested to BS EN 1303:2015, meaning it is insurance rated.