SUNWAYFOTO DMP-140R MP 140mm Rail Nodal Slide Arca & RRS Compatible Clamp Sunway SUNWAYFOTO brand Arca-Swiss & RRS Lever Clamp Compatible Accepts QR's from RRS Wimberley, Jobu, Arca Swiss, Kirk, Markins, etc. Multi-Purpose Rail Nodal Slide DMP-140 w 40mm Clamp includes Bubble Level Precision machined from solid aircraft-grade aluminum