Unidecor 138 ANSI Standard Heavy Duty Electric Strike Lock NO NC Mode Adjustable(4.88Lx1.69Wx1.65H inch) Holding 1000kg. Special design,easy to adjust the distance of the Lock-tongue. Designed for Metal Frame drill a hole,then install it directly. Testing to 500000 cycles. High-Temperature Painted,Duable and Beatiful Artical.