Model:FF5005-3, FF5005-5, FF5006-3, FF5006-5, FF5008-3, FF5008-5, FF5010-3, FF5010-5, FF5012-4, FF5012-5, FF5020-3, FF5020-4 Diameter:50mm Lead:5mm, 6mm, 8mm, 10mm, 12mm, 20mm Number of circulation:3 or 4 or 5 RIGHTthread Length: as customer request Accuracy:P1(0.006mm per 300mm),P2(0.008mm per 300mm),P3(0.012mm per 300mm) P4(0.016mm per 300mm),P5(0.023mm per 300mm),P7(0.052mm per 300mm) If customer has special request, please send the drawing, we also produce as your drawing if we can.Thanks.