Barre Bantam Pneumatic Stone Carving Hammer Pneumatic carving hammer with 5/16" short stroke piston for all types of stone. Use with Trow & Holden Bantam Chisels (w/ 5/16" round shanks). Also available as a tool set. Each tool is individually numbered and test run for 8 hours. Guaranteed for life against defects. Requires only 3 cubic feet at 90 psi of air.