38mm Black-Anodized Aluminum Post Holder, 1/2-in posts, 1/4-20 Thd.

PHV-series post holders are made from aircraft-grade aluminum alloy and are designed to mount to standard M6 or 1/4-20 optical tables. The inner diameter is sized for standard 12.7-mm (1/2-in.) optical posts and provides stable, 3-point clamping for excellent kinematic stability. The clamping knob has a spring-loaded Delrin tip to ensure smooth fine adjustment of the post, prior to clamping. To make it easier to identify the post-holder heights, all but the shortest post have graduated scribe-lines at 25-mm intervals around the circumference. The PHV post holders also feature an additional threaded clamp-knob hole for better adjustment accessibility when large platforms are post mounted.