Lee Electric, 4, Mortise Type Knockout Electric Door Strike, 8 - 16 Volt AC, For new or replacement installations in wood jambs. Use with locksets with individual deadbolts. Dead bolts cannot be released electrically. Use with locksets having up to 5/8” throw, based on 1/8” door gap. Face Plate 6-1/4” x 1-3/8” -- Deadbolt Knockouts Top & Bottom 1-11/16” x 9/16” -- Mortise Backset 2-3/4” -- Cavity Depth 1/2” -- Cavity Width 9/16” -- Cavity Height 1-1/2”.