CRL Red Head Sleeve Anchor is a heavy-duty expansion sleeve anchor whose six-rib design assures holding power in cement block, thin wall or solid concrete, brick or stone. Hex nut head allows fastening of numerous fixtures for industrial and commercial applications. Anchor can be installed through objects to be fastened. Maximum work thickness is 2-1/8 inch (54 millimeter).25 anchors per box. Holds In Cement Block, Brick, Stone, Thin Wall or Solid Concrete