GROUP11*4mm ADAPTER+1*6.35mm ADAPTERGROUP21*4mm ADAPTER+8*4mm bitsGROUP31*6.35mm ADAPTER+10*6.35mm bits
GROUP 1：1*4mm ADAPTER+1*6.35mm ADAPTER；GROUP 2：1*4mm ADAPTER+8*4mm bits
GROUP 3；1*6.35mm ADAPTER+10*6.35mm bits。
4mm ADAPTER:If your screwdriver takes 1/4"(6.35mm) bits and you want to use 4mm bits. This adapter is for you.6.35mm ADAPTER:If your screwdriver takes 4mm bits and you want to use 6.35mm bits. This adapter is for you.
Easy to use,Good Performance and long life.
brand new and high quality.