Basic protection at low theft risk. Recommended for securing low-range bicycles and children’s bikes. Technologies: 4 mm chain with synthetic coating to prevent damage of the bicycle’s paintwork,The chain is made of special steel,ABUS quality locking cylinder,Two keys are supplied with the lock,ABUS quality automatic cylinder with user-friendly reversible key,.Transport: Convenient transport around the seat post frame,. Tips: Very handy use because the chain can be locked with only one click without using the key .