Nylon sleeve provides additional protection for equipment. Mini weatherproof U-lock features a hardened steel body for maximum strength and reliability. 14mm diameter shackle is made of hardened steel for maximum resistance to cutting and sawing. High security disc cylinder prevents picking and the dual locking levers provide resistance against prying and hammering. Hardened Steel Chain & Mini U-Lock Nylon Cover Prevents Scratching Disc Cylinder for Pick Resistance Double-Locking Shackle for Pry Resistance Hardened Steel Chain & Mini U-Lock Nylon Cover Prevents Scratching Disc Cylinder for Pick Resistance Double-Locking Shackle for Pry Resistance