4-Way Makro Focusing Sharpness Lead Rail For Photography Makro : 4 sliding rail focusing mechanisms can be incorporated into four actions with two 6" rails: forward, backward, wiw right (Klindly please tighten the knobs after adjustment to stop from moving after you have it) One standard 1/4 inch screw, which is the frequency for bellows, and , lampa extending makro or makro lenses, including FL, others with the impact of films and SLR effects Durable mechanical drive rail with transmission, which increases the strength of the positive focus blocking knob Can easily estimate camera distance, smooth gear and gear mechanism provides extremely accurate focus Rail adjustment mechanism allows you to get the help of two tools double the possibility of precise distance modification Specification: Material: plastic Size: 16x16. 5xm : black Maximum fee: 2,5 kg contains: -road rail slider focus makro