Simpson CSD25400MG 1/4" X 4" Countersunk Head Split-Drive Anchor - Galvanized, Pkg 100 Quik Drive Cement Board Screws Self-Drilling Point: Eliminates the need

Self-Drilling Point: Eliminates the need for pre-drilling by cutting directly into metal substrates for faster installation

Simpson flat head type 316 stainless steel screws are designed to fasten securely in fiberglass

To avoid the possibility of corrosion

Cold-formed steel framing

Simpson CSD25400MG 1/4" X 4" Countersunk Head Split-Drive Anchor - Galvanized, Pkg 100 Quik Drive Cement Board Screws Self-Drilling Point: Eliminates the needThe Split Drive anchor is a one piece expansion anchor that can be installed in concrete, grout filled block and stone. As the anchor is driven in, the split type expansion mechanism on the working end compresses and exerts force against the walls of the hole. The Countersunk head allows for a smooth surface when attaching wood or light gauge steel to concrete and grout filled block surfaces. Installation: For Common Rafters: Drill a hole in base