Really Right Stuff ARC-LR Adjustable R-LOCK Lever-Release Photo Clamp
R-LOCK (short for Rapid-Lock) System adds unique safety-stop features which are built in to both a mounting rail and quick-release clamp that adhere to the RRS 1.5" Standard. The "hard-stop" feature is comprised of a 5mm diameter steel pin that engages 5.5mm diameter holes in the rail. In addition to supplementing the traditional friction-based clamping mechanism, the interface prevents unintentional repositioning of the rail within the clamp when the R-LOCK is engaged.R-Mount Interface R-Mount's rosette will prevent twisting at the coupling point between the ARC-LR and RRS head over time, and will assist in eliminating "play" that results from regular use on our earlier tongue-and-groove designs.Easy Top-Loading In one quick action, the clamp can go from closed to fully open, allowing easy top-loading of RRS Dovetail and arca-swiss compatible quick-release platesVisual Confirmation of Lock Position You can readily observe if the lever is locked, half-open or fully openAdjustable Clamp Tolerance For the first time, the ARC-LR allows users to adjust a RRS clamp's jaw tolerance to conform to some 3rd party Arca-style plates or rails.