Strainer- x STEALTH -off axis typeS 05 C This part goes onto the side of a snare drum , and is used to anchor the snare wires on the bottom drum head. they work with a butt plate on the opposite side of the drum Mounting Screws ARE included. This model has very a cool feature, the 2 vertical mounting screws slide up and down in a channel, so it will fit various hole spacings. Maximum hole spacing is 35mm. Minumum will slide down to 18mm center to center. Thats 1 2 inch to 1 1 2