Our firm sticks to the basic principle of "Quality is the life of your company, and status will be the soul of it" for Well Curve, 172mm Power Section, Diamond Core Bits For Granite, Impregnated Diamond Core Drill Bits,Bi Center Drill Bit. We have a big inventory to fulfill our customer's requires and needs. The product will supply to all over the world, such as Europe, America, Australia,Colombia, San Diego,Ukraine, Mauritania.We pay high attention to customer service, and cherish every customer. We have maintained a strong reputation in the industry for many years. We are honest and work on building a long-term relationship with our customers.