Gem Bids For 6 Spline Cutting Hob Module: 3.5 Pressure Angle 30 Deg. To Drg. No. 765-15-156. Malt. : Asp-30 Pregrinding Hob For Driving Gear To Drg. No. 172- 45-178-1 Mod3 P. A. 20 Degree Od 80mm Bore Dia. 32