The Stone Tools professional grade 4 way chuck key with stainless steel finish is an ideal accessory for securing drill bits onto drill presses. When compared to the black oxide finish, the stainless steel finish makes this key last longer and be more rust resistant by adding strength to the steel. Most importantly, this chuck key is compatible with various, popular chucks such as Jacobs branded drill chucks.
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.