The QD Arca to spigot adapter will allow you to quickly attach and adjust your Valhalla bipod on a Arca rail .                        It has three positions open , slide and lock .                                                                                                                                          It can be fine adjusted to your Arca rail by tightening or loosening the adjusting nut .                                                             This adapter will only integrate with the Spartan Valhalla Bipod