Compel four of solid device and cut open stone material reaming screw

The utility model relates to a compel solid device field, disclose a compel four of solid device and cut open stone material reaming screw. Among above -mentioned this compel four of solid device and cut open stone material reaming screw, establish the nut at the one end spiral shell of a threaded rod, the other end closes with the mutual spiral shell of sleeve after wearing to establish the hole of mounting, wherein, this sleeve of the aforesaid is a hollow bobbin personally experiences sth. Part of the body, and the flange of hexagon is established to its one end of being close to the mounting, and this flange links firmly a section of thick bamboo portion that outwards is the convergent form, and the terminal of this one is connected with an opening that outwards is the flaring, and the circumference of just following the bobbin body is equipped with four groups a from a section of thick bamboo surperficial V type grooving that extends to the opening surface, and this grooving impels this telescopic openin