SHB Manufacture Gear Hobs in HSS M2, M35 and ASP 30 material. Gear Hobs for Spur and Helical Gears in single start and multistart threads can be Supplied in Class ‘A’ and Class ‘AA’ accuracies conforming to DIN 3968 standard with pitches ranging from 0.5 to 25 Module or equivalent D.P.’s in various pressure angles.