New Small Hex Shank Bit Adapter 4mm to 6.35mm 1/4" Scewdriver Bits Adaptor Holder - Magnetic, 2pcs/lot - AliExpress
Wiha 75802 - Sys 4 Micro Bit Adapter 4mm to 1/4" 25mm - Canucktools.ca
Hex Bit Adapter 4mm to 6mm – Chodyra & Co IT Solutions
yuanhaourty Screw Driver Bit Adapter Set, 6.35mm 1/4 inch Insert Bit Adapter To 4mm Bit Hex Holder Screw Driver Bit Adapter Manual/Electric Screw Driver Bit Adapter - - Amazon.com
Wiha 75802 System 4 MicroBits Adapter 4mm to 1/4" 25mm - - Amazon.com
ADAPTER 1/4" auf 4 mm Mini Bits - Minischrauben.com
TIERPOP 6.35mm 1/4" Insert Bit adapter to 4mm Bit Hex Holder Screw Driver Bit Adapter - Walmart.com
Wera Tools 051500 Combination Bit Holder 1/4" Hex to 4mm HIOS or Halfmoon