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this patent invention is in the field of drill bit, and in particular, a core drill bit of a simple structure is simple, convenient and practical and can extend the life of the service, including the drill body, with diamond composite. instrument network product library provides you with cement drill concrete, special drill road core drill bit detailed, including product brand product model price and supplier and other information for you to check, and you can also concrete with cement drill. there have been existing gray soils in buildings through many years of gel, the shaft mechanism described in a texture hard building is made of a plumb drill, and a jacket drill bit set is composed of this practical new type.