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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#1 888-741-1115. Phone Number: The best phone number to call Direct Express Customer Service is 888-741-1115. Alternatively, you can also look at the back of your card for the most up-to-date customer support telephone number and instructions. Support Hours: Customer Service representatives are available 24 hours a day, 7 days a week.