Metal Rubber Clamps: the metal tool holders are equipped with 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, 2 roof rack clamps total load bearing capacity is about 62 lbs and bottom mounting area is about 2.56 x 1.18 inches/ 6.5 x 3 cm Clamp Mounting Kit: includes 2 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: install metal rubber clamp mount kit on roof rack, track bed rack to keep shovel, axes, hammer, rake, hoses, securely in place; Widely applied on work vehicles, trailers, off road trucks, 4 x 4s, RVs, boats or on