Super Quick Fist Clamp 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. Specifications: Holds objects from 2-1/2 to 7-1/2″ in diameter (64 to 191mm) Each clamp supports approximately 50lbs (23 kg) Mounting base measures 7/8 x 6″ (22 x 152 mm) 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