Screw Driver Bit Adapter Bits Set Screwdriver 6.35mm 1/4" Insert Bit Adapter to 4mm Bit Holder 3 Types screwdriver bit adapterFeatures:brand new and 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 hardness.for Extra hard with natural finish for durability and strength.Exact fit machined tips for secure hold, for always stay safely.Screw driver bit adapter with very easy to operate while working.Specifications:Material: Tool Steel Size: 1/4” Length: 25mm/ 1.0 inPackage Includes:1x Screw Driver Bit AdapterNote:Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid.Due to the difference between different monitors, the picture may not reflect the actual color of the item.