ALEKO Clamp 20022 Supper Quick Fist Rubber Clamp Quick Release Holds objects 2-1/2" to 9-1/2" in diameter. Mounting base measures 6" x 7/8". Attaches easily with 3 #10 bolts or screws (not provided) One clamp supports a safe working load of 50 lbs. Holds tools, Tanks and Fire Extinguishers 2-1/2" to 9-1/2" in Diameter, up to 50 lbs.