1 Â Type Specification: Â D*L 2. Application: for making cutting tools, for example end mills, dental burs, reamer etc. 3. Diameter: 0.3-50mm 4. Length: standard 330mm or customized 5. Surface: ground or blank 6. Material: WC+CO 7.Grade: K05-K40 8.Hardness:87.6-94HRA 9.T.R.S:3000-4200