X4P Boxer short shackle U-lock mated to a 3.5' chain with massive 14mm 0.55'' link titanium reinforced chain. Perfect for powersport users who travel fast but need maximum protection for high crime areas. Boxer U-lock can also be used alone as a disc lock. Chain Dimensions 110cm x 14mm 3.57' x 0.55'' Shackle Diameter 16.8mm 0.66'' Hardened Steel.