System 4mm Micro Bit Adapter Magnetic Holder 6 35mm to 1/4 Hex Pack of 5
New 6.35mm 1/4" Insert Bit adapter to 4mm 4 Screwdriver Bit Adapter Magnetic Holder. Or your screwdriver handle holder size is 1/4”/6.35mm and you want to use 4mm bits to work. If your screwdriver takes 1/4” bits and you want to use 4mm bits.