Features: 1Scope of Application: High speed steel step drill bit set is very suitable for cutting holes on various materials including steel brass wood plastic etc. 2Drill Perfect Round Holes: After heat treatment and high polishing the step drill bit set can drill perfect round holes in steel brass plastic wood etc. 3Side Shank Design: The side shanks design in order to prevent slippage when in chuck. Exquisite workmanship beautiful appearance design. 4Cut Quickly and Smoothly: Two flute design drives faster smoother and cleaner cuts. Each step is clearly labeled with the depth diameter in steps. 5High Speed Steel: Step drill bit set for metal and wood is made from high speed steel material which is sturdy durable and has long service life. Specification: Item Type:StepDrillBitSetMaterial: High Speed SteelColor: As Pictures ShownWeight: Approx. 120g / 4.2ozScope of Application: Thin Iron Plate Aluminum Insulation Plate PVC Plate Cutting etc.Product Specification:4-20mm (4mm 6mm 8mm 10mm 12mm 14mm 16mm 18mm 20mm) 76MM Handle3-12mm (3mm 4mm 5mm 6mm 7mm 8mm 9mm 10mm 11mm 12mm) 79MM Handle4-12mm (4mm 6mm 8mm 10mm 12mm) 67MM Handle Package List: 3 x Opening Drill Bit1 x Transparent Box