These conical bushings are strung on the steel bars remaining in the concrete connecting the formwork, touching the inside of the formwork. The formwork is fixed with a key. After pouring the concrete and stripping, the cones are removed. The protruding ends of the steel rods are cut with oxygen to the bottom of the conical cavities. The gaps are filled with reparative cement material.

Hole diameter - 8 and 10mm. Length - 40 mm. Diameter of force - 50mm.