Speed Plate DFW-60 QR w Side Access Screw 60mm Arca/RRS Compatible w 40mm Metal Flywheel for Lens or Camera Desmond Arca-Swiss / RRS compatible QR plate. Easy Access 40mm Diameter all metal flywheel makes attaching and removing to a camera or lens easy and quick. All Metal Construction. 2 x 1/4"-20 Hex safety screws. Perfect fit for RRS Lever Clamps