Red Head 5/8-in x 5-in Concrete Wedge Anchors (10-Pack)Red Head Wedge anchors are heavy duty anchors designed for fastening into solid concrete. Ideal for attaching 2 x 4, sill plates, and electrical equipment. Also good for attaching structural supports to concrete, tilt up construction, highway rails and posts, electrical, HVAC and plumbing systems, metal doors and window frames. Ideal for fastening into concrete Great for attaching structural supports to concrete, tilt up construction, highway rails