PRE SHAVING GEAR HOBS ,PRE-GRIND GEAR HOBS ,WORM GEAR HOBS,SEMl-Toppling GEAR HOBS ,inserted BLADE GEAR HOB ,Fine Pltch Gear HOB Detailed Product DescriptionClass B. mm Module Outside Dia Overall Length Hole Dia. 1 50 40 1.25 1.5 45 1.75 55 22 2 50 2.25 60 2.5 65 55 2.75 3 70 60 3.25 65 75 3.5 70 3.75 60 80 4 75 4.5 85 85 5 90 90 5.5 100 95 32 6 105 100 PRE-GRIND GEAR HOBS