Sleeve-All expanding anchors are pre-assembled, expanding sleeve anchors for use in all types of solid base materials. This anchor is available in acorn, hex, rod coupler, flat or round head style for a wide range of applications. What is a sleeve anchor used for? Sleeve anchors are the most versatile masonry expansion anchors because they can be used in a variety of base materials, including concrete, brick, and block. They are available in a wide variety of diameters, lengths, and head styles. The available head styles are acorn, hex nut, flat, countersunk, and round head.