dashan expansion screws

Description

Expansion screws wedge Angle is used to prompt friction grip of, fixed effect.Screw with a head thread, a head of a taper.Bread outside a tin (have a plenty of steel tube), iron cylinder (steel tube) half number of incision, put them together into a good hole in the wall, then lock nut and the screw nut to pull, pull taper into the tin drum, tin drum is open, so firmly fixed on the wall, and is generally used in fence, awning, air conditioning, etc on the materials such as cement, brick of fastening.

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