Lee Electric, 12, Mortise Type ANSI Standards Chrome Electric Door Strike, 4-7/8", 16 Volt AC, Chrome (US26D), For new or replacement installations in metal jambs. Use with locksets having up to 5/8” throw, based on 1/8” door gap. Face Plate 4-7/8” x 1-1/4” -- Mortise Backset 1-5/8” -- Cavity Depth 9/16” -- Cavity Width 9/16” -- Cavity Height 1-1/2”, Mounting hardware included.