This is the Park Tool SD-Set Screwdriver Set. If you want to use the same professional quality tools that your local shop uses every day, they will last a lifetime in your home work station. Shop quality screwdriver designed for comfort and durability. Featuring dual density grips and heat-treated tips and shafts. Four shop grade screwdrivers (SD-0, SD-2, SD-3, SD-6) in one handy set Features heat-treated, chrome vanadium tips and shafts for durability The ergonomic, dual-density handle offers excellent comfort and grip Specifications: Tip Size: #1 Tip Size: #2 Tip Size: 3.0mm Tip Size: 6.0mm