Tripod Mounting Post for Universal Binocular Mount (UBM)The 3 8 16 Tripod Mounting Post is the standard interface between the Farpoint UBM and a photo tripod. The 3 8 16 thread is the universal large photo tripod thread, used by virtually every professional and astronomy grade tripod on the market. What it's for The Farpoint UBM ships with one of these mounting posts. Buy this product to replace a lost or damaged post, or to keep a second post on a different tripod so you can move the UBM between mounts