http://www.shallfastener.com/anchors/ S-6015 Zamak Hammer Drive Anchors The anchor is made from zamak. This anchor is designed for use in Concrete, Block, and Brick. It is very important not to install the anchor any closer than 1-1/4" from an unsupported edge of the concrete. Feature and Advantage 1. Can be used in a variety of applications making job easier and faster. 2. Makes it easy to determine the hole size. 3. Once installed, fastener cannot be removed, very secure. Specifications Item Weight0.040kg Product Dimensions1/4’’x2’’ SizeFull size MaterialZinc alloy&steelAnchors suppliers website:http://www.shallfastener.com/anchors/