Step Drill, Takenoko Drill, Step Drill, 0.2 - 1.4 inches (4 - 35 mm), Step Drill, Metal, Steel, Wood, Plastic, Resin, Bamboo. (Daily Style 0.25 inch (6.35 mm) Hex Handle Compatible with Electric Drills) Adopts a daily 0.25 inch (6.35 mm) hexagonal handle that fits rechargeable and corded electric drills. Easy to install and stable rotation. (118° bi-rear angle design for smooth drilling) The tip has a 118° double back angle design for easy drilling positioning and improved drilling speed. (Helix Tank Design Efficiently Discharges Scaves) The shape of the spiral tank allows for smooth drainage of debris produced during cutting. Reduces cutting resistance and reduces power consumption. (High Speed Steel Material for Durability and Sharpness) Uses high speed steel material and heat treated. The product has good processing performance, high strength and toughness. Sharp edge even after grinding the blade and stable quality. (Cobalt Plating on the Surface for Enhanced Heat Resistance and Abrasion Resistance) The surface of the cobalt increases the heat dissipation of the drill and extends the service life. Product Specifications: 4-35 mm Step Drill (14 levels): 4-6-8-10-12-16-18-20-22-25-28-30-32-35 mm Blade Length 3.0 inches (76 mm), Drill Total Length 4.1 inches (107 mm). Compatible Materials: Metal, wood, iron, bamboo, plastic, resin, acrylic, etc. 【Anti-rust Oil and Eco-Friendly Packaging】The drill is professionally treated and coated with dry rust resistant oil. The packaging is made of environmentally friendly plastic material. Step Drill, Drill Bit, Drilling Drill, Drill Bit, Iron Work Drill, Metal Drill, Drill, Carbide, Bamboo Drill, Hole Expansion Drill, Spiral Drill, Hexagonal Shaft Drill, Drill, Drilling