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 Description·When ordering,please offer date as follows1)Module or diametral pitch m or D P 2)Pressu re angle P.A.3)Teeth of gear manufactu red Z,in usual condition Z=35. SEMl-Toppling GEAR HOBS