Various grades & types of button bits can be produced based on the rock hardness, drilling machine’s model and power. Hengcheng can supply blank & finishing grinding bits in different grades and types. These products are widely used for mining, oilfield, city construction, water & electricity, transportation. It is indicated that Hengcheng’s button bits have stable quality, good performance, and without the defects of pore and crack after over 10 years using by our customers.