ITEM NAME:Golden Titanium HSS4241 Step Drill Bit Triangle Handle Spiral-Groove 15sizes Description: Made from high speed steel, 1/4 inch Triangular Shank. Wear resistance and hardness for better and faster hole drilling. The ladder of its unique structure, a bit can open a variety of specifications of aperture. Fits for hardness of 25 degrees such as carbon steel, plate, insulation board, PVC board, wood, sheet thickness below 4mm. Step drill 4-32mm (15 steps: 4,6,8,10,12,14,16,18,20,22,24,26,28,30,32mm). Specification: Material: HSS 4241 Color: Golden Package Includes: 1 Piece Step Drill Bit Note: The color may have different as the difference display, please understand. Please allow 1-3mm error due to hand test..1 Piece Step Drill Bit. The ladder of its unique structure, a bit can open a variety of specifications of aperture. Color: Golden. Fits for hardness of 25 degrees such as carbon steel, plate, insulation board, PVC board, wood, sheet thickness below 4mm.