The Stone Tools professional grade 4 way chuck key with black oxide finish is an ideal accessory for securing drill bits onto drill presses. This key is made of high quality steel with black oxide for increased wear resistance. Most importantly, the chuck key is compatible with many chucks such as Jacobs branded drill chucks.
The Stone Tools Model Number ST-12 Master Chuck I, the original professional master chuck key, opens heavy duty 3/8-Inch to 3/4-Inch chucks. Made from heat treated alloy steel with a black oxide finish, it will open over 86 different chucks. Squared center of the key will open acetylene tanks.