Material: These heavy duty truck top clips are made of sturdy aluminium support can withstand heavy pressure, they are especially useful if you have larger fabric coverings installed on the bottom of your bed where the shell attaches to the bed. Easy Installation: Quickly installed in minutes, the truck mounting clips are used for mounting around the mounting brackets on the lower tilt of large loading trucks. The bolts can be quickly tightened with a spanner or wrench, no drilling required, great if you don't want to drill holes for permanent installation. Non-Slip Design: Our truck bed clamps feature small nuts that prevent screws from slipping when tightening. The texture on the clamps increases contact friction and provides a good grip. Note: Please measure the relevant dimensions before purchasing, the maximum applicable size is 1.7 inches, we recommend letting these camper van bed clamps do their job and not overuse them to prevent bending. Applicability: Suitable for Chevrolet:Silverado/Sierra1500,2500,3500.for Silverado/Sierra07;CargoRail;for Dodge:Dakota;Ram1500,2500,3500;for Ford:F150F250;for Toyota etc QYMOPAY Truck Cap Mounting Clamps, Heavy Duty Camper Shell Clamps for Chevy Silverado Sierra 1500/2500/3500