General description These 10 pieces machine reamers are designed for precision machining of holes. Made from high-speed steel, they offer exceptional hardness and durability, making them suitable for a variety of materials. Technical specifications Sizes: 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm Material: High-speed steel (HSS) Surface treatment: Suitable for iron, plastic, wood, copper, aluminum, and other soft materials Usage Applicable for friction molding and handcrafting Widely used for drilling processing Compatible with drilling machines and milling machines