stainless Steel Wedge Anchor Expansion Bolt 

Expansion bolts can be used to secure heavy objects to walls or floors. Can handle vertical and horizontal loads. By tightening the bolt, the nut on the opposite end pulls into the shell, expanding it outward and wedging it inside the hole in the wall or floor. Requires a spanner or socket wrench to fasten or undo the bolt. Ideal for heavy duty fastening of steel and wood structures walls and floors. In addition to producing bolts, Hongchuang Hardware can also provide nuts,Washer and pins,