The All Aluminum BPH Slotted-Base Post Holder is a patent pending re-invention of the classical optical post holder, combining a slim slotted base with a unique post holder. The top surface of the post holder has a series of kinematic indentations which, when used with the BPH-C-5 Post Collar, provide repeatable rotational alignment and indexing at 45-degree increments. The base features both angled and straight reference surfaces allowing edge-to-edge placement of adjacent post holders and, with the addition of the BPH-XB-5 Base Extender, can convert to a double-slotted base. The flat bottom also makes mounting more versatile and improves stability.

M1BPH-3 holding SP-3.5 post and M1 mirror mountBPHThe BPH design integrates a slotted base with a post holder as a single part. The kinematic indentation are visible on the top of the post holder.BPH-C-5_Detail_postThe BPH-C-5 Indexing Post Collar shown in use on the BPH-3 Post Holder provides repeatable angular positioning of the post.BPH-XB-S_Detail-baseThe BPH-XB-5 slotted extension base slides into the grove at the base of the BPH post holder and is secured with a screw through the top of the post holder\'s inner diameter.