1. surface set diamond bit Explanation: A kind of diamond drill bit . The steel cylindrical bit body has a wire buckle on the upper part and a sintered drill head body on the lower part. The diamond particles are encrusted on the surface of the drill head body. The outer diameter of the carcass is slightly larger than the diameter of the steel body and the inner diameter is slightly smaller than the diameter of the steel body. There are grooves inside, outside and at the bottom that allow water to pass through the carcass. During drilling, washing fluid is used to carry away rock powder and cool the bit. Diamond-impregnated bits are all encrusted with natural diamonds and are therefore expensive, so they are only used in hard formations that are particularly difficult to drill. Diamond-impregnated drill bit is more commonly used in oil drilling. 2. impregnated diamond bit Explanation: A kind of diamond drill bit. A drill bit whose head body is uniformly encrusted...