Use with the Original QUICK FIST clamp #10010 (sold separately) to mount a flashlight, shovel, axe, high lift jack or other tools to a roll bar. Use with the SUPER QUICK FIST clamp #20020 (sold separately) to mount a fire extinguisher, air tank, nitrous tank or other tools to a roll bar. The safe working load for two QUICK FIST Roll Bar Mounts on roll bars less than 1.5” in diameter is 50lbs. Roll bars 1.5” in diameter or larger, the safe working load is 100lbs. Fits all roll bars from 1” to 2.5” (25 to 64mm) in diameter.