Also make sure the shank of the bit (the end opposite the cutting end) will fit in your drill chuck. Chucks come in 1/4, 3/8 and 1/2, which is the maximum diameter of shank that will fit inside. 3/8 is a good general purpose size, and most large bits have reduced shafts to fit in a 3/8 chuck.lso make sure the shank of the bit (the end opposite the cutting end) will fit in your drill chuck. Chucks come in 1/4, 3/8 and 1/2, which is the maximum diameter of shank that will fit inside. 3/8 is a good general purpose size, and most large bits have reduced shafts to fit in a 3/8 chuck.
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