... drawing dies, and other wear-resistant components. Drill bits and reaming shells made with TSP diamonds ... suitable for drilling in soft rocks with hardness below 7 degrees, such as lime rock, marble, shale ... coarse grains. Specifications:TSP diamond for oil drill bits are suitable for oil&mining fields, ... cutters, etc. It can be applied on the drill bits for oilfields. Available Shapes:Triangle, cube, ...