This lock offers fail-secure operation (NO Mode); In the case of power-on, the lock tongue can be opened, when power is lost, the strike locks the door. This electric strike lock is used to convert a cylindrical lockset into an electronic access-controlled locking system. 304 stainless steel bolt structure, the structural linkage is made of steel and hardened to resist severe impact. Provide 1,100-pound (500KG) holding force/static strength. This strike lock is specially designed to fit most metal or wooden doors with only minimal cutting required of the door frame beyond the hole for the strike. Before ordering, please check the size of door's frame to avoid wrong purchase! If you have any problem, we will be happy to help you within 24 hours., Weight: 0.67902376696 pounds, Manufacturer: YUHANUS