Wiha says their micro bits are 4mm in diameter, and suggests to use special adapter for 1/4 screwdriver. Obviously these 4mm micro bits are smaller than 1/4 inch, but are they compatible with 1/8 hex driver?

2 Answers 2


I can't see how they would be compatible.

¼" = 6.35mm
⅛" = 3.175mm


A 4mm to 1/4" adapter would work, but the effort to make one would be about the same as the effort to make a 4mm driver and handle.

That said, wiha make one already, and its under $5 US. Wiha's SKU is 75802


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