This is a new upgraded V yoke from Hammers Precision line. It can be used as a monopod or tripod accessory to convert a regular monopod or tripod into a shooting stick rest. Here are some of the features of the V yoke:
3inch openning at the top
Brass insert at the bottom with 1/4-20 thread that fits all standard monopods.
Rounded rubber ridge molded over the top of the V to provide a soft resting surface and the same give good grip on the fore end of the gun stock for steady support.