This heavy duty bike lock is made of hardened -performance steel shackle which resist cutting, sawing and scratching to prolong the life of your lock.This heavy duty bike lock is made of hardened -performance steel shackle which resist cutting, sawing and scratching to prolong the life of your lock.The combination bike lock comes with 16mm/0.63inch U lock and a 14mm/0.39inch diameter 1.2m/4 feet long extremely durable woven steel cable for double of security .Suit for s, motorcycles, gates and fences,etc.The bike U-lock comes with 2 rust-resistant copper . of can be used in life, and the other can be left at home, in case you lose it.The bike U-lock comes with 2 rust-resistant copper . of can be used in life, and the other can be left at home, in case you lose it.The lock cylinder of the bike lock is made by pure copper blade, which has a precise structure to prevent technical opening,effectively resists violent lock picking. Dust cover effectively prevent corrosion from rain and debris extending lock life.Comes with a mounting bracket,can fasten and take it away at . you can refer to our instructions to install it.Comes with a mounting bracket,can fasten and take it away at . you can refer to our instructions to install it.