Ball Screw 1204 w/ Anti-backlash Nut Diameter: 12mm Pitch or Lead: 4mm Starting from 5 Meters in length n 5 Nuts. Ball screw diameter 12mm, 16mm, 20mm, 25mm and lead 4mm, 5mm or 10mm, Machining Service to match BK10 n BF10, BK12 n BF12, BK15 n BF15, BK20 n BF20, please leave us message or send us em...