Electric Door Strike With Vertical Adjustment. Vertical Adjustable Deadbolt Opening, Sliding Shim Keeper, and Deadlatch Ramp Accommodates A Wide Range of Lock Types, Accommodates Deadbolts Up To 1, 12/24 VAC/VDC Operation, Fail-Safe (Door Unlocks When Power Is Lost) or Fail-Secure (Door Locks When Power Is Lost) Operation. Static Strength - 1,000Lbs, UL Listed