Screw Driver Bit Adapter Precision Bits Set Screwdriver 6.35mm 1/4" Insert to 4mm Hex Holder 3 Types

There are 3 different types sandblast/nickel-coated/chrome-coated, choosing according to your needs. If your screwdriver takes 1/4” bits and you want to use 4mm bits. This adapter is for you.or your screwdriver handle holder size is 1/4”/6.35mm and you want to use 4mm bits to work. modified tool steel with high hardness. for Extra hard with natural finish for durability and strength. Exact fit machined precision tips for secure hold, for always stay safely., Manufacturer: Kobeleen