Kiwifotos FC-1 Close-up Macro Focusing Rail Slider For Canon Nikon Sony Olympus Samsung Camera Tripod Mount Thread Size: 1/4'' - 20 thread Weight: 1.19lbs ( 538g) Dimensions: 6.5 x 7.25 x 2.75" ( 16.5 x 18.5 x 7cm) X axis: 10.50'' (27cm) Y axis: 10.25''(26cm)