Locking device e.g. frustum-shaped plug, for concrete wall, has metal disc with optical attractive visible surface superimposed on front surface, where diameter of disc is larger than largest diameter of block out

摘要

The device has a shaft, front cone and a front surface. A metal disc with an optical attractive visible surface is superimposed on the front surface, where the metal disk consists of a stainless steel, bronze, copper and light metal. The side surface is polished, engraved, and painted. The diameter of the metal disc is larger than the largest diameter of a block out in concrete units (10).Clamping ribs are molded at the shaft.