Simpson CSD25312 1/4" X 3-1/2" Countersunk Head Split-Drive Anchor - Zinc, Pkg 100 Blue Concrete Screws When installed on the forms

When installed on the forms with the StrapMate® strap holder

Stud-to-foundation strap-tie holdown connections

For use with carbon & stainless steel anchors

To avoid the possibility of corrosion

Drives Fast with No Pre-Drilling – Saves time and effort thanks to the sharp tip and aggressive threading

Simpson CSD25312 1/4" X 3-1/2" Countersunk Head Split-Drive Anchor - Zinc, Pkg 100 Blue Concrete Screws When installed on the formsThe 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