The HES 5300 Series Electric Strike is a fire-rated compact, high performance electric strike designed for low profile openings where there is limited space behind the jamb. Its strength is derived from a unique keeper pin locking design, enabling the 5300 to exceed the ratings of the frame, door and locking hardware. This field selectable fail safe/fail secure unit is easy to install and accommodates latchbolts up to 5/8" throw. * NOTE: Fail safe negates the fire rating of the product.