Description This vernier regulation focusing rail slider is designed for all digital and film SLR cameras. Suitible for most Nikon, Minolta and Pentax macro and DSLR cameras. Smooth rack and pinion movement provides extremely fine focusing adjustments. The geared drive system can greatly accuracy and of adjustment of the slider. Features - Color: As shown - Size: 16 x 9.2 x 2cm - This vernier regulation focusing rail slider is designed for all digital and film SLR cameras. - Suitible for most Nikon, Minolta and Pentax macro and DSLR cameras. - Smooth rack and pinion movement provides extremely fine focusing adjustments. - The geared drive system can greatly accuracy and of adjustment of the slider. - The screw size is deigned with standard : 1/4" screw, fit most tripods and copy stands. - Focusing rails are essential accessories for macro photography, which requires precise distance modifications and a steady hand, as well as other situations where accurate camera positioning is crucial.Packing list1 x focusing rail slider