Sliding Bolt Spacer used to fit between Sliding bolt mount and door. During Recent Project found the Sliding Bolt I was installing needed to be about 5mm away from the door in order for the bolt to clear the door jamb. Sliding bolt is standard household size - about 1 1/2" x 3" (including the receiver which I did not use).Print and mount under Sliding Bolt base - ensure this one fits your base.