Stone Tools ST-12A The Original Professional Stainless Steel Master Chuck I
The Stone Tools Model Number ST-12A Master Chuck I, the original professional master chuck key, opens heavy duty 3/8-Inch to 3/4-Inch chucks. Made from tough, heat treated 17/4 polished stainless steel for extra wear and rust resistance, it will open over 86 different chucks. Squared center of the key will open acetylene tanks.