Material: HSS (High-Speed Steel) 4241, Titanium Coated. Application: Ideal for cutting through metal, wood, plastic, and thin iron plate (hardness <25 degrees). Chamfering range: 2-5 mm, 5-10 mm, 10-15 mm, 15-20 mm; Shank diameter: 6 mm, 8 mm, 10 mm, 12 mm; Head diameter: 10 mm, 14 mm, 21 mm, 28 mm. 90-degree angle on the tip for clean and precise milling, used for chamfering circular openings or conical holes. These bits should be used with a bench drill; they are prone to shaking, which will affect the chamfering effect if used with a hand drill. Color: Chamfering bits 4pcs. Features: This 4-piece milling and deburring tool set is ideal for quickly and easily cutting metal, wood, and plastic. Ideal for cutting through metal, wood, and plastic (hardness <25 degrees). Specifications: Color: Gold Material: 4241 High-Speed Steel (Titanium) Size (four types): 2-5 mm, 5-10 mm, 10-15 mm, 15-20 mm Size (chamfer with angled holes x length): 2-5 mm (2-5 mm x 45 mm) 5-10 mm (5-10 mm x 47 mm) 10-15 mm (10-15 mm x 62 mm) 15-20 mm (15-20 mm x 82 mm) Package includes: 4 x Milling and Deburring Tools