The Long Arm Quick Fist holds objects from ½" to 4.5" (13 to 114mm) in diameter. This clamp mounts easily with two ¼" (6mm) bolts or screws. Each clamp supports a safe working load of 50 lbs. Break strength is 150 lbs. Long Arm Quick Fist clamps are ideal for holding high lift jacks, anything that coils (rope, wire, hose), tools, and fire extinguishers. Quick Fist clamps are made in the USA of heavy duty transportation grade rubber (same stuff as tires) and are not affected by hot or cold climates. The rubber is also UV, salt and chemical resistant.