The BI-OP-S,Series Engraved Optical Mounting Posts are precision-ground stainless steel posts with a laser-engraved millimeter scale for quick and accurate height adjustment. Featuring a 12.7 mm diameter, M4 and M6 threaded holes, and cross-drilled holes for easy tightening, they provide stable and reliable mounting. Compatible with standard 12.7 mm optical post holders, they are ideal for laboratory and industrial optical applications.