Lee Electric, 6, Rim Surface Mount Type Door Opener Electric Door Strike, 8 - 16 Volt AC, For surface mount installations on metal or wood jambs, for in-swinging applications. Use with locksets or night latches having up to 5/8” throw, based on 1/8” door gap. When mounted on a pair or doors, strike is mounted to the inactive leaf. Case 2-1/8” x 1-3/16” -- Surface Mounted -- Die Cast Housing -- Cavity Depth 1/2” -- Cavity Width 1/2” -- Cavity Height 1-3/8”.