Electric Door Strike 4 7/8 inch Stainless Steel for Wood and Metal Doors Dimensions - 4 7/8" L x 1 1/4" W x 1 1/4" H Designed for use with cylindrical and mortise lockets with up to 5/8 inch (15mm) throw latch Fail Secure: Door remains locked during power failure and Opens when the electric strike is powered Operating Voltage - 12VDC 250mA Heavy Duty design: tested for 1 million operations, Forcing strength 2800Lbs, Great for high traffic