You are ordering Part #3522031C
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Designed for higher torque capabilities of power tools and allows more clearance between the power tool and fastener. 1/4" shank diameter. No. 3520031C: No. 1 Phillips No. 3520071C: No. 2 Phillips No. 3520111C: No. 3 Phillips No. 3521091C: No. 6-8 slotted No. 3521111C: No. 8-10 slotted No. 3521131C: No. 10-12 slotted No. 3522031C: No. 1 square recess No. 3522051C: No. 2 square recess