This set includes rubber covers and matching screws for brake master cylinder and caliper bleed screw applications on and motorcycles.The components offer resistant protection for bleed screws on disc brake calipers and master cylinders.Designed to fit common thread sizes found on 50cc, 100cc, 125cc, 150cc, and 250cc scooter and motorcycle models.Compatible with various disc brake systems used on mopeds, ATVs, and motorcycles, including models such as CBR, CRF, CT, and CBX.