China Anchors suppliers S-6010 Three Pieces Heavy Duty Anchors Concrete Sleeve Anchors' design allows them to anchor into concrete, brick and block. Turning the nut pulls the working end of the sleeve anchor up through the sleeve, expanding and anchoring itself securely in the concrete, brick or block. Feature and Advantage 1. Made of high quality carbon steel with good anti-corrosion surface coating. 2. Expansion type anchors used to fasten fixtures into a variety of base materials. 3. Versatile and ideal for concrete, or masonry. http://www.shallfastener.com/anchors/