Hillman Drive Wall Anchors 1/8 D Xs 60 Lb. 2/Card Size: 1/8DXS. Drill size: none. Grip range: 1/8" to 1/4". Body length: 3/4". Screw length: 1-3/8". No pre-drilling necessary. When anchor is fully expanded, spider-like legs draw tightly against backside of the wall. Two prongs on the head of the shell prevent the anchor from rotating during expansion