The product is composed of a fixed body and a sliding body. The sliding body can be composed of a section, two sections or a plurality of sections. Through the flexible change of the number of sliding body, thereby to obtain the ideal length, to meet the needs of customers. Can be used with rotary drill bit, long stroke, can complete drilling operation. Suitable for the construction of the basic construction of the rapid hole drilling operations, and can have multiple functions, high efficiency characteristics.
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