Manfrotto R4190.21 Ball Lock Knob Assembly

The 3 Legged Thing QR4 Release Plate is designed for ultimate functionality, compatible with standard 38mm Arca Swiss compatible bases, and QR4 sits tight to your camera without any movement or drift. With milled stainless steel camera screw, the QR4 is secure and strong.

The GoCoupler GSC200 allows you to attach an additional GoRail at the end of the Series 2 SystemGo center column, to make it height adjustable & more versatile.

The GoRail adds flexibility to your SystemGo tripod when combined with the matching GoCoupler. The GSR140 is compatible with the GSC190 GoCoupler.