Nylon Nailon Nail Expansion Pin Drive Anchor, Diameter: 1/4 IN, Length: 1 IN, Minimum Embedment Depth: 1/4 IN, Drill Size: 1/4 IN, Head Type: Mushroom, Material: Nylon Body, Nylon Pin Cold Rolled Steel, Tension Strength: 20 LB, For Anchoring And Fastening Systems For Concrete And Masonry