The monster thatcham approved lock from oxford is an ultra strong disc lock suitable for use with all motorcycles featuring a hardened ni cr mo alloy steel shackle and double locking mechanism with 2 hardened steel bolts the monster provides an impressive level of security and is designed to deter even the most persistent experienced thieves with widened access points the monster is a lot easier to fit than other smaller disc locks and can be used with motorcycles fitted with larger thick