The Pendaliner SR gives you twice the protection of ordinary bedliners! Its skid-resistant top helps protect your cargo by reducing cargo movement. And its skid-resistant bottom helps protect your truck bed by reducing bedliner movement. You get double the protection with Pendliner SR! Under-rail - A perfect fit if you expect to mount a truck cap, tonneau cover or side rail on your truck, the Pendaliner SR under-rail model also offers the added features of two-tier and compartmental loading. It's easy to separate your cargo with Penda's molded-in board holders.Specially designed detents, a Penda exclusive, lock boards into place. Our board holders are custom designed to match your truck. Their strength is supported by the truck bed, so every load is rock-solid. Our vertical boardholders help separate your load for even greater protection. They also offer another option for double-layer loading, so you have maximum versatility. No-Drill Installation on your bedliner.