The HES 9400 electric strike is completely surface-mounted with a unique 1/2" slim-line form that is ideal for 1/2" throw rim exit devices in steel, aluminum or wood frames. The product is UL 1034 listed and exceeds ANSI/ BHMA Grade 1 standards. Designed with a smooth new profile, the 9400 series features a cover that conceals the mounting screws and offers a sleek surface for superior looks and added strength.