An Astro-Physics stainless steel counterweight shaft in virtually Like New condition. It is from a 600E mount and is 1-1/8" in diameter, 14.5" long overall, 13.75" in length not counting the threaded part, and has the standard safety knob and washer.
Have an AP-400 mount? Use this longer than standard 400 c/w shaft to balance that heavier load (instead of buying another more expensive counterweight). Or ideal for a ATM project.
$20 includes shipping in CONUS.