OptoSigma Helicoidal Post Holder – RSN-12.7
-For Half Inch Post
-Lower External M16P1 Threads

From the Manufacturer:
?Turning the height-adjustment rotary section allows movement of 10mm (about 5mm/ rotation) in the height direction.
?To secure a holder, insert its post into the post holder, and clamp it using the two clamp screws on the side of the main body. The upper clamp screw on the side of the main body is designed to secure a post, and the lower clamp screw is designed to secure a helicoid ring.
?Fitted with a helicoid screw, these post holders can move the installed post up and down without turning it.
***MPN RSN-12.7
***OEM OptoSigma
***SKU*** 57781