Model Number: GM-DB033 Brand Name: GOLDMOON Key Specifications/Special Features: 4pc HSS Spiral Grooved Step Drill SetSurface:White Finish or Titanium Coated are available. Straight Grooved are available.Size include:1/8" - 1/2" x 13 step1/4" - 3/4" x 9 step 3/16" - 7/8" x 12 step 1/2" - 1" x 9 stepSurface treatment are available:Galvanized finish,Nickel Plated,Chrome coated,Black finish,Sandblasted finish.Material can be selected according to customers' requirements.Drill Bits set are availableInch size are available