Ergo Grip Rail Protector, Rail Covers, Fits 18 Slot Ladder, Black Finish 4373-3PK-BK ERGO Grip's 18-Slot Low-Pro Ladder Rail Cover (3-pack) protects unmounted rail areas on your Picatinny rail from damage and shields the operator from sharp rail edges. Easy to install" they cover the rails of your quad rails while the rubberized texture protects your accessories. Molded of highly tactile Santoprene allows for improved weapon control with a low profile and a rubbery" high-friction texture. This is a package of three 18 slot 7" ladder rail covers.