Check the listing for details. 2pc set Involute machine Lathe Change gears 48 & 60 teeth tooth 1/2" Bore Hole. Condition: Used. Listed at 94.50 USD. Item .................. Here we have a very nice 2 piece set of gears, not sure what type of lathe they fit. Manufacturer ... Boston Info on the Gear with 48 teethWidth ................. The teeth are .504" wideWidth Overall .... 1.004" includes the hubHub Diameter .... 1.298" Outside dia. Diameter ............ 3.121" largest outside dia. Hole Size ............. 1/2" Type ..................... cast iron ??Info on the Gear with 60 teethWidth ................. The teeth are .504" wideWidth Overall .... 1.131" includes the hubHub Diameter .... 1.430" Outside dia.Diameter ............ 3.875" largest outside dia. Hole Size ............. 1/2"Type ..................... cast iron ?? Condition ............ Very nice used, no chipped teeth They will be very well protected during shipping. machinery huge extra spare parts