... pcd 2.TC & PCD 3.drilling 4.kinds of diameter 5.end thread dia 16 & 14mm metal Drilling ... Bit:1.drill tip pcd 2.TC & PCD3.drilling4.kinds of diameter5.end thread dia 16 & 14mmR25N, R32N, R32S, ... R38N, R51L, R51N, T76N, T76SVarious shapes of bits for various rock formations will be available according to ... rock formations R25/51MM/EXX0.45EXX machined kinds of alloy steel bit drill tip pcd