Sleeve anchor has other names, it's also called block sleeve anchor, concrete sleeve anchor. The anchors are versatile masonry expansion anchors. Sleeve anchors are available in zinc plated carbon steel and stainless steel. The anchor is made up of four parts: nut, washer, threaded stud and sleeve. At one end of the thread stud is cone-shape and rest is threaded. The sleeve is a tubular piece of steel and the bottom end of the sleeve is split. When the thread stud is pulled up through it, the bottom of sleeve expanded. Concrete sleeve anchor is can be used in the following base materials: concrete, brick, block, mortar. The applications are from light to heavy-duty fastening. The anchor has five head styles: hex, flat, acorn, rod, round.