The precision FR3 Focusing Rail from Kirk is designed for macro, nature, panorama, and commercial photography where exact camera positioning is key. It incorporates a 2.6" Arca-type quick release plate receiver that can rotate 360° at 90° intervals and allow you to mount a camera body or collared lens. Made of CNC-machined aluminum, an Arca-type dovetail extends the full length of the FR-3 rail, and a standard 1/4"-20 tripod is in the base. The focusing screw mechanism offers both large and fine adjustments for quick and detailed adjustments. The FR3 rail comes complete with a neoprene storage bag, making it easy to tuck in a camera bag, purse, backpack, or jacket pocket.