Stone Tools ST-13A The Original Professional Stainless Steel Master Chuck 2
The Stone Tools Model Number ST-13A Master Chuck 2, the original professional master chuck key, opens 1/4-Inch to light duty 1/2-Inch chucks. Made from tough, heat treated 17/4 polished stainless steel for extra wear and rust resistance, it will open over 127 different chucks. Squared center of the key will open acetylene tanks.