【Material High-quality material】 These reamers are made of high speed steel and are very hard. 【High precision】 Sharp cutting edge, large cutting capacity, high precision, long service life. 【Material Suitable material】Surface treated iron, plastic, wood, copper, aluminum and other soft materials. 【Use Appropriate Use Applic】 Applicable for friction molding and handcrafting. 【Widespread】 Widely used for drilling processing and installed in drilling machines, milling machines, etc.