Mammoth Thatcham 11 mm Motorcycle Shackle Lock With Free Disc Lock Reminder The Mammoth Thatcham 11 mm motorcycle shackle lock is a superb choice for riders looking to keep their bike safe and secure while they're on the move. A hardened steel body which is drill and pick resistant acts as a great deterrent to any thieves and shows that you're serious about your motorcycle security! Every disc lock comes with a free reminder cable to ensure that you don't forget you have your disc lock secured before you pull off. Motorcycle Shackle Lock Features: Hardened steel lock body. Double bearing lock mechanism. 11 mm hardened Cr-Mo steel closed U-shackle. Reinforced cylinder plates. Resists drilling and picking. Extended length shackle and body. Thatcham approved. Certificate number: TQA585. Includes free disc lock reminder cable.