Concrete Screw, made by the special steel and the heat treatment, Used to install the building, bridge,seat or the subway tunnel. They are the heavy duty products.Easy to install and remove. They have hex head and flange head style. The surface treatment could be zinc plated, HDG, dacrotized plation.
Preassembled for quick and easy installation. High holding power by tough sleeve can be used in heavy duty applications. Vibration resistance.
Nut spring washer and washe are pre-assembled.
The tough sleeve is made of seamless steel fube or Seamed tude.