GearWrench 8916 16 Piece Ratcheting Screwdriver Nut Driver Set Includes: 1 - Stubby GearDriver Handle. 7 - Interchangeable Fractional Nut Driver Shafts: 3/16", 1/4", 5/16", 11/32", 3/8", 7/16", and 1/2". 8 - Interchangeable Metric Nut Driver Shafts: 5, 6, 7, 8, 9, 10, 11, and 12mm Fine tooth ratcheting mechanism Interchangeable Nut Driver Shafts Contoured handle features a dual durometer grip