GOOD/STRAIGHT ALUMINUM FENCE BAR. GOOD RACK FOR FENCE PINION TO RIDE ON. I CLEANED FACE NOT GROUND USED SCOTCH BRITE PAD. MINOR LIGHT SALTY OXIDE TARNISH U CLEAN. 8 1/4 16 1/2 BC 5/16-18 TAPPED HOLES SEE PICS. USED ON MANY OLDER MODELS APPROX 1 1/2 X 1/2.