Parallel Side Spline Hob: 1.Accuracy: ClassA/B Class A is used for finish machining; Class B is used for hobs with grinding allowance of 0.30mm to0.40mm. 2.Type: type 1-applied to spline shafts centred according to external diameter; type 2-applied to spline shafts with convex shoulder centred according to external diameter; type 3-applied to spline shafts centred according to internal diameter with bottom diameter grinding allowance; type 4-applied to spline shafts with convex shoulder centred according to internal diameter with bottom diameter grinding allowance. Involute Spline Hob: 1.Module: m0.5-m10 2.Pressure Angle(α): 20°- 45° 3.Accuracy: Class A/B 4.Specificaitons(mm): ModuleOutsideDia.OverallLengthHoleDia.0.54532220.75150351.25401.5501.7563633222.5371713.5459090610010081121124010125125 We can provide all kinds of gear hobs, gear shaper cutters and gear shaving cutters.If you have any requirement, pls contact us. We'll try our best to satisfy you. You're welcome every time, all the time.