Extremely durable chain lock.high quality design of all parts of the lock and top security of the bike.the symmetrical keys allow convenient handling of the lock from all positions.the length of the chain is a respectable 100 cm and its diameter is an excellent 10 mm. The chain is housed in a durable polyester case. Safety Security Level 18/25 Comfort Durable polyester cover Symmetrical keys Construction Chain length 100 cm Chain diameter 10 mm