Hi-Spec 44pc Metric 1/4in Impact Screw Driver Bit Set. Hex Shank S2 Steel Screwdriver Bits Box Set for Electric Drill Drivers and Power Screwdrivers - Amazon.com
Magnetic Impact Phillips Bit #2 Insert Bits 1/4 Inch Hex Shank Cross Impact Driver Bit for Power Drilling - China Impact Screwdriver Bit, pH2 Screwdriver Bit | Made-in-China.com