Solid Aluminum Construction - The hollow-out bottom plate further reduces the weight of the rail to only 440g/0.97lb; This focusing rail can support camera and lens combinations of up to 10kg/ 22.05lb; 180mm/7.09in Length - This rail has a travel range of 170mm/6.69in; There are engraved index marks on both sides of the rail for fine adjustments; Large Adjustment - Press and hold the push button for quick and large adjustments; Minor Adjustment - The thumb-screw knob/collapsible crank handle produces 1.25mm of movement per revolution; Fine adjustments down to 0.01mm are possible; 360 deg. Rotating Head - Four angles are available: 0 deg., 90 deg., 270 deg., 360 deg.; The clamp is securely locked in place after each 90 deg. of rotation; Detachable Feet - The rail comes with four detachable feet for tabletop use; Arca-Type Plate - The double-dovetail plate allows the rail to work with most Arca-type clamps on the market; Dual-Axis Movement - Stack one rail on top of the other for more flexible dual-axis movement; Versatile - The Quick-Release Plate features rubber pads and stop blocks to increase friction and lock the camera securely in place