Specifications 1)Bit diameter:20mm-70mm
2)Tapered connection:4,6,7
3)ISO9001-2000 quality
4)Jingyanggang brand /OEM
Rock drilling tools 1)The chisel bits is made with high quality of raw material through special heat treatment. 2)Diameter of bits from 20mm to 70mm with 4 ,6,7degree. 3)Suitable carbide tips. 4)Suitable for wooden box or plastic box Used in coal mining,stoning,and tube engineering.