Feature:1. Made of superb high speed steel, wear resistant, reliable and long-lasting.2. Double g-roove design for faster and smoother cutting provides you better use experience.3. Divserse specifications can meet different drilling needs.4. Mini size and light weight make it portable and space-saving for storage.5. Suitable for workpiece with hardness is less than 25, such as carbon steel, iron plate, aluminum plate, pvc plate, wood board and so on.Specification:This set of step drills made of superb steel material. Different specifications can meet different drilling requirements. What are you waiting for? Just come and buy.Features:Made of superb high speed steel, wear resistant, reliable and long-lasting.Double g-roove design for faster and smoother cutting provides you better use experience.Divserse specifications can meet different drilling needs.Mini size and light weight make it portable and space-saving for storage.Suitable for workpiece with hardness is less than 25°, such as carbon steel, iron plate, aluminum plate, pvc plate, wood board and so on.Specifications:Material: high speed steel 4241Color: yellowQuantity: 5pcsType: 1, 2 (optional)Size:1/4" to 1-3/8" (10 steps): 1/4", 3/8" 1/2", 5/8", 3/4", 7/8", 1", 1-1/8", 1-1/4", 1-3/8"3/16" to 7/8" (12 steps): 3/16", 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8"1/4" to 3/4" (9 steps): 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4"1/8" to 1/2" (13 steps): 1/8", 5/32", 3/16", 7/32", 1/4", 9/32", 5/16", 11/32", 3/8", 13/32", 7/16", 15/32", 1/2"3/16" to 1/2" (6 steps): 3/16", 1/4", 5/16", 3/8", 7/16", 1/2"Shank diameter:1/4" to 1-3/8": 8mm / 0.3in3/16" to 7/8": 8mm / 0.3in1/4" to 3/4": 8mm / 0.3in1/8" to 1/2": 6mm / 0.2in3/16" to 1/2": 6mm / 0.2inPackage size:Type 1: 150 * 110 * 40mm / 5.9 * 4.3 * 1.6inches(Length * Width * Height)Type 2: 90 * 70 * 70mm / 3.5 * 2.8 * 2.8inches(Length * Width * Height)Package weight:Type 1: 480g / 1.1lbType 2: 300g / 10.6ouncePackage list: (optional)Type 1:5 * Step Drill1 * Aluminum BoxorType 2:5 * Step DrillPackage List:(optional)Type 1:5 * Step Drill1 * Aluminum BoxorType 2:5 * Step Drill