The CPS is a composite plastic standoff designed for increased concrete surface area. No. CPS6: 5-5/16' L. x 5-5/16' W. x 1' H., use 4-10d fasteners in post and 5/8' anchor bolt. No. CPS4: 3-1/4' L. x 3-1/4' W. x 1' H., use 4-10d fasteners in post and 5/8' anchor bolt. No. CPS5: 4-1/8' L. x 4-1/8' W. x 1' H., use 4-10d fasteners in post and 5/8' anchor bolt.