BI-OP Series Optical Mounting Posts are precision-ground stainless steel posts designed for stable and reliable optical component mounting. Featuring a 12.7 mm  diameter, they provide excellent rigidity and durability for laboratory and industrial applications. Each post includes an M4 threaded hole on one end and an M6 threaded hole on the other for versatile mounting options. Cross-drilled holes allow easy tightening and adjustment during installation. Compatible with standard 12.7 mm optical post holders.