Hillman 0.164 in. D X 1-1/4 in. L Plastic Round Head Ribbed Anchor comes in 100-pack. The Ribbed plastic anchors work with various diameter sheet metal screws and are ideal for anchoring in concrete, brick, or wallboard. The anchor is corrosion-resistant. A pre-drilled hole is required. Recommended for quick and easy fastening types of fixtures. This anchor can be used in a variety of light-duty applications.