Feature:1. High speed steel and titanium coating material ensure the high durability and will stay new and shiny for years to come.2. Non walking drill tip provides faster and smoother drills on steel sheets, aluminum sheets, wood board, plastic board etc.3. Made of quality high speed steel for extra durability and service life, and the board must be smaller in thickness than the height of step drill bits.4. The drill bits set includes five standard step drill bits with a two flute design for faster and smoother cutting.5. Suitable for drilling holes in plastic, aluminum, copper, stainless steel and many other types of sheet metal.Specification:Item Type: Inch Step Drill Bit SetMaterial: High Speed SteelPurpose: Inch Step Drill BitSystem: InchDrill Bit Type: Step DrillHandle Type: Triangular Round HandleDrilling Size Range:#1 Ladder Drill: 3/16-1 / 2#2 Ladder Drill: 1/8-1/2#3 Ladder Drill: 1/4-3/4#4 Ladder Drill: 3/16-7/8#5 Step Drill: 1/4-1-3/8.Package List:5 xInch Step Drill Bit Set1 x Aluminium Box