Alpha designs and manufactures imperial or metric dimensioned ground ball screws. We also repair/remanufacture ball screws. Our manufacturing capabilities include:-Ball circle diameters from 0.5" to 12.0" or 10 mm to 300 mm-High Helix or square lead (50 x 50)-Lengths up to 40 feet-Ground thread class to P3 or C1-Carbon and stainless steels