Simpson CD25212M 1/4" X 2-1/2" Mushroom Head Crimp Anchor - Zinc, Pkg 100 Hex Head 410 Stainless Steel Concrete Screws These screws meet the requirement

These screws meet the requirement of the tile roofing institue as described in ESR-2015P

Type 17 point - drives quickly into material and minimizes splitting

The Simpson Strong-Tie HLPC/HTPC straps are non-notched

Engineered for speed and grip in metal-to-metal connections

Simpson CD25212M 1/4" X 2-1/2" Mushroom Head Crimp Anchor - Zinc, Pkg 100 Hex Head 410 Stainless Steel Concrete Screws These screws meet the requirementThe Simpson Strong Tie Crimp Drive anchor is an easy to install expansion anchor for use in concrete and grout filled block. The pre formed curvature along the shaft creates an expansion mechanism that secures the anchor in place and eliminates the need for a secondary tightening procedure. This speeds up anchor installation and reduces the overall cost. The low profile mushroom head works excellent for attaching wood or light gauge steel to concrete