Lee Electric, 3, Rim Type Door Opener Electric Door Strike, 8 - 16 Volt AC, For surface mount installations, on wood or metal jambs, for in swinging applications with surface mount. Use with locksets and night latches having up to 5/8 throw, based on 1/8door gap. When mounted on a pair of doors, strike is mounted to the inactive leaf. Surface Mount -- Case 4-11/16 x 1-1/4 -- Cavity Depth 1/2 -- Cavity Width 9/16 -- Cavity Height 1-1/2.