SunwayFoto Multi-Purpose Rail Nodal Slide with Screw-Knob for Arca RRS Clamp SUNWAYFOTO brand Arca-Swiss compatible Accepts QR's from RRS Wimberley, Jobu, Arca Swiss, Kirk, Markins, etc. Multi-Purpose Rail Nodal Slide DMP-200B w 40mm Clamp Double Arca Dovetails Precision machined from solid aircraft-grade aluminum