Powell Rib Bone Rails - WhiteMade from long lasting UHMW Polyethylene plastic to endure the trauma of skateboarding, these rails feature 5 holes each to firmly and securely attach them to your skateboard. Unlike the OG Rib Bones they feature wood screws so you dont need to drill out your board. All you need is a Phillips head screwdriver. Features: Long Lasting UHMW polyethylene 14" Long Screws Included 2 rails Predrilled with mounting screws.