Super Quick Fist Super Quick Fist is ideal for holding fire extinguishers, oxygen cylinders, CO2 tanks, and other equipment. Mounts easily with three #10 (5 mm) bolts or screws (not included). Can be mounted with strap facing any direction. Typical uses: •Mount a large fire extinguisher with Super Quick Fist. •Super Quick Fist neatly stores chart holders. •Super Quick Fist affixes a D-size oxygen cylinder. •Two Super Quick Fists hold a 7" CO2 tank.