Simpson CSD25400 1/4" X 4" Countersunk Head Split-Drive Anchor - Zinc, Pkg 100 Collated Roofing Nails it’s built to resist rust

it’s built to resist rust and corrosion

they are often used for wood and other materials

Flat head with ribs provides clean countersinking in wood

Metal roofing

with easier

Simpson CSD25400 1/4" X 4" Countersunk Head Split-Drive Anchor - Zinc, Pkg 100 Collated Roofing Nails it’s built to resist rustThe 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