SUNWAYFOTO MP 140mm Rail Nodal Slide Arca Compatible Clamp DMP-140 Sunway SUNWAYFOTO brand Arca-Swiss 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