3" Quick Fist Clamp for mounting tools & equipment 2-3/4" - 3-1/4" diameter Holds objects from 2-3/4-inches to 3-1/4-inches (70 millimeters to 83 millimeters) in diameter Each clamp supports 50 pounds (23 kilos) Not affected by hot or cold climates UV resistant; made of heavy duty transportation grade rubber Mounts easily with one 1/4-inches screw or bolt (not included)