Sleeve anchors are inserted into pre-drilled masonry materials where they expand to ensure installation, anchoring objects on concrete or bricks. When the nut is tightened, the cone-shaped stud end is pulled into the expander sleeve, thus wedging it outward and locking the anchor in place.Sleeve anchors are in the form of hexagonal, flat and round heads as well as rod-type hangars and rubber nuts. Diameters range from 1/4" to 3/4" and lengths from 5/8" to 8-1 / 2", you will surely find the anchor you are looking for. Most sleeve anchors can be purchased in convenient bulk or discount bulk cartons. If you need help or need customized plating quotes, please let us know.