South Bend 11 metal lathe reverse switch 24 and 27 tooth Nylon 2 gear set This is a FDM made Nylon gear set of two This gear 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 Do not waste money for ABS, PLA plastic gear that may strip or melt Gear face width .68 (11/16") 24 tooth gear diameter 1-5/8 (1.625) 27 tooth gear diameter 1-4/5 (1.8125) Center bore (not keyed) 5/8 Diametrical Pitch 16 Part number: Thank you.