1)spherical shape 2)use in tricone rck bit, dth bit, hammer bit 3)abrasve resistance 50000 4)OEM 5)our patent product Product applications:SDB Diamond Hammer Bit Inserts Series is a proprietary product of our company. The products have replaced the traditional tungsten carbide inserts, usually applying to roller bits, air hammers and DTH (down-the-hole) bits and so on, especially in hard and ...