evolution standard bike u-lock heavy duty anti-theft bicycle u lock 14mm shackle with mounting bracket and keys high security lock for bicyc

14mm hardended max performance steel shackle resists hand tools, bolt cutters, and leverage attacks.note: measure your door's backset, cross bore and thickness to ensure you find the right fit. key safe program; will ship your first 2 keys for globally, in the event you lose them..syi