Red Head Wedge Anchor, Series: True bolt, 3/4 in Anchor Diameter, 5-1/2 in Anchor Length, 3-1/4 x 6-5/8 in Minimum Embedment Depth, Steel, 2 x 4 ft, Sill Plates, For Tilt-Up Construction, Highway Rails and Posts, HVAC and Plumbing Systems, Metal Doors and Window Frames. Designed for fastening applications in solid concrete. Corrosion resistant. Anchors are building code approved.