4mm bit adapter by MiNisHELL | Download free STL model | Printables.com
UFS-108 1/4" Hex Adapter to 4mm Hex Bit by UncleFrankSays | Download free STL model | Printables.com
6.35mm 1/4" to 4mm Insert Bit adapter and Hex 4mm to 6.35mm 1/4" Scewdriver adaptor w/ T6 security screwdriver Bit for Mac Mini|Hand Tool Sets| - AliExpress
Hex Bit Adapter 4mm Screwdriver Solid Magnetic Slot Insert Durable Jack Holder 372237986489 | eBay
6.35mm 1/4" Insert Bit adapter to 4mm Screwdriver Micro Bit Holder Magnetic | eBay
Hex Bit Adapter 4mm to 6mm – Chodyra & Co IT Solutions
New Small Hex Shank Bit Adapter 4mm to 6.35mm 1/4" Scewdriver Bits Adaptor Holder - Magnetic, 2pcs/lot - AliExpress
BINYOU 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