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.