Omni Advanced Series 9300 Single Tilting Prism Assembly. Omni coated prisms are manufactured to very high-quality optical standards. All reflective surfaces are provided with a resistant coating to avoid loss of reflectivity which protects these surfaces from adverse conditions such as dirt or condensation. All metal holder and quick release locking mechanism. Three target sizes available. Stainless steel hardware, Hermetically sealed 62 mm (2.5") Precise Prism. -30mm & 0 offsets. Fully compatible with instruments from Sokkia, Topcon, Pentax, Nikon, etc. Standard available colors are orange/white, yellow/black, hi-vis chartreuse/black.