General description Nitrogen treated to increase hardness and abrasion resistance, this 2X HSS Step Cone Drill Bit set features 14 sizes ranging from 4 to 42 mm. It is designed to automatically deburr holes as you drill, making it suitable for a variety of materials including steel, wood, thin iron, aluminum alloy, insulation board, and PVC sheet. Ideal for workpieces with hardness below 25 degrees, this tool is a versatile addition to any DIY or professional toolkit. Technical specifications Sizes: 4-42 mm (14 steps: 4, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42 mm) Handle diameter: 10 mm, round handle Product length: approximately 98 mm Material: High Speed Steel Color: Gold Packaging: OPP bag Measurement error: +/- 1-3 cm Package Contents 2 x 4-42mm HSS Step Cone Drill Bit