Kryptonite New York Legend 1590 Chain Bicycle Lock with New York Padlock Bike Lock 15mm round chain links made of3T HARDENED STEELresists bolt cutters Reinforced, shrouded padlock shell and 16mm hardenedMAX-PERFORMANCE STEEL SHACKLEprovides ultimate protection HardenedDOUBLE DEADBOLTdesign gives additional protection against twist attacks HIGH SECURITY DISC-STYLE CYLINDER Protective nylon cover with hook-n-loop straps to hold it in place Includes3 STAINLESS STEEL "I" KEYSfor better ergonomics Key Safe Program Product dimensions: 3 (90cm) chain length 16mm shackle diameter Product weight: 9.50 lbs (4.31 kgs) 15mm round chain links made of 3t hardened steel resists bolt cutters Reinforced, shrouded padlock shell and 16mm hardened MAX-Performance steel shackle provides ultimate protection Hardened double deadbolt design gives additional protection against twist attacks High security disc-style cylinder Protective nylon cover with hook-n-loop straps to hold it in place Includes 3 stainless steel I keys for better ergonomics Key Safe Program