Metal Rubber Clamps: the metal tool holders are equipped with metal supporting brackets and quality rubber buckles; This tool grips with nice load bearing capacity, holds shovel tightly and stably, and keeps truck equipment and tools from rolling around during rough rides Size Specifications: the quick release clamps are for mounting tools in about 0.67-1.57 inches/ 17-40 mm, 4 roof rack clamps total load bearing capacity is about 50 lbs and bottom mounting area is about 2.56 x 1.18 inches/ 6.5 x 3 cm Clamp Mounting Kit: includes 4 roof rack mounting brackets, you can install this shovel holder clamp in record time; You can mount this shovel holder for truck to a flat with drilling, or use the rubber clamps mounted to roof rack, cargo rack, bumper or bed rack WIDE APPLICATION: Attach the metal rubber clip mounting kit to roof racks, track racks to hold shovels, axes, hammers, rakes, hoses firmly in place; can be widely used on vehicles, trailers, off-road trucks, 4 x 4 cars, ATVs, RVs, boats or other walls. Warm Reminder: please make sure the installation area and supported diameters meet your needs before purchasing; Tools with a diameter smaller than 0.67 inch result in loose fixation Please note: There is a slight color difference or discrepancy in kind, please don't mind, thank you! Colour:black Material:zinc alloy Package Contents: 4 x Wall Mounting Brackets Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.