1.  Type Specification:  D*d*TK*LB,  L indicates the length, B indicates helical angle,� 30 degree the most, and 15 , 40 , 45 re optional 2. Application: for making cutting tools, such as drill. 3. Diameter: 6.3mm to 20.3mm 4. Length: standard 330mm/310mm or customized 5. Surface: blank or ground 6. Material: WC+CO 7.Grade: K05-K40 8.Grain Size: fine, medium 9.Hardness  87.6-94HRA 10.T.R.S  3000-4200
