Hillman 3/8 in. D X 1/2 in. Log in. L Zinc Round Head Ribbed Anchor comes in an 8-pack perfect for application on brick, concrete, and hollow blocks. Powers Power-Stud is a long lag shield 1/4 inch screw style anchor for use with lag bolts. For use in concrete, brick, and hollow blocks. The 8-pack is perfect for larger projects or for those who want to have extras on hand.