Kolpin Rhino Grip - Double - 21505 Features off-set mounting to maximize rack space; Sold as a pair Durable and flexible rubber grips designed to carry light-weight items. (Up to 15lbs.); Rubber Securing straps Designed to fit trucks, SUVs, ATVs, UTVs, RVs, trailers, pretty much anything. Drilling required to mount on some composite racks; Sold as a pair; Mount to any tubular or square bar from 5/8"-1-1/4" in diameter OR to any flat drillable surface; Available in 4 styles: Single (21500), Double (21505), Window Suction Cup (21520) and Window/Wall Mount Adhesive (21525)