1st rail is a conventional Screw Knob Clamp, 2nd
Rail is a captive Lever Clamp Use the
screw clamp to achieve the correct width then use the lever clamp for
rapid exchange of QR Plates. Jaw
opening range of 38mm to 41.5mm will accommodate any virtually any
brand of Arca style plate
60mm in Length.
3/8"-16 Threaded mounting hole with included 1/4"-20 adapter