South Bend 9/10K lathe 48 tooth Nylon gear Outer diameter 2.7778 (70.5mm) Center bore 0.5625 (9/16) with single 0.125 (1/8) key gear face width .375 (3/8") Diametrical Pitch 18 Part number: 32K48N1 This gear FDM made out of out of Nylon - tough and flexible plastic No lubrication required Only Nylons should be used for gears where a slippery surface is desired. All other materials (PLA, ABC, PET, etc.) will grind creating a plastic dust and eventually fail! For details, please review all pictures and compare to OEM gear shown Do not waste money for ABS, PLA plastic gear that may strip or melt Thank you. buss bars.