Powers™ Nail Drive Anchor, Series: Nailin™, 1/4 in Dia, 1-1/4 in Overall Length, Mushroom Head Head, Zamak Alloy, Zinc Plated, 1/4 in Drill, 5/16 in Hole Dia, 5/8 in Minimum Embedment Depth, 35/65 x 9/64 in Head, 440 lb at 2000 psi for Normal Weight Concrete Shear Strength, 410 lb at 2000 psi for Normal Weight Concrete Tensile