7/8″ Thick Hardened Steel HEX Shackle for MAX Security!; Solid “Die Cast” Body Absorbs Hammer Blows, Protects Against Severe Weather, and Contains Patented Dual-Purpose U-Lock Capability.; Unmatched Patented Dual Lock System for MAX Cut Resistance.; Dual Purpose! Built-in U-Lock delivers MAX wheel-lock security — pair it with chains, cables, and more for unstoppable protection!