Power Strut U Post base features steel construction with electro-galvanized finish for long lasting du73ility. It measures 6-Inch x 6-Inch. It has hole diameter of 9/16-Inch, 13/16-Inch spacing from end and 1-7/8-Inch spacing on center. Post measures 1-5/8-Inch x 3-1/2-Inch x 1/4-Inch. It is perfect for PS 200 and PS 210 channels. Post base meets ASTM standards.