Optical Mounting Posts are precision ground 0. 7 mm) diameter stainless steel posts with two standard sized holes tapped into each end. Each post is supplied with a 8-32 (or M4) double-ended set screw. These posts are 1/2 inch in diameter and incorporate precision machined features which make them more convenient to use. Built from durable materials, they ensure repeatable alignment and reliable optical system performance. This page features Ø1/2" posts and Ø12 mm posts and pedestal posts constructed from solid stainless steel. 75" (20 mm) to 12" (300. Choose from our selection of optical posts, including male-female pillar posts, female pillar posts, and more.