Strike Anchors are designed for concrete applications only. For installation, anchor is inserted into pilot hole, nail is struck and expands the anchor, locking it in place. These anchors are removable with a claw hammer. *; ; Brand Name: Hillman Diameter: 3/4 in. Length: 6 in. Material: Steel Head Style: Round Head Product Type: Strike Anchor Number in Package: 10 pk Screw Included: Yes Packaging Type: Boxed Thread Type: High/Low Required Drill Hole Size: 3/4 in. Screw Length: 6 in. Minimum Embedment: 3-1/2 in. Capacity: 1015 lb Application: Concrete