Powers® Concrete Screw Anchor, Self-Threading, Series: Tapper+®, 1/4 in Diameter, 2-1/4 in Overall Length, Hex Washer Head Drive, Case Hardened Carbon Steel, 1-3/4 in Minimum Embedment Depth, 3/16 in Drill, Blue Perma-Seal Coated, Applicable Materials: Concrete/Lightweight Concrete/Grouted Concrete/Masonry/Hollow Concrete Masonry (CMU)/Solid Brick Masonry/Wood, High/Low Thread, 9/64 in H Head, 1500 lb Shear Strength, 2995 lb Tensile Strength