Logan 200 Lathe 30 tooth rear head stock spindle Nylon gear 30 tooth, 1-5/16 bore This fine Nylon gear has improved design for better durability and performance It is superior to other plastics replacements FDM made out of Nylon - tough and flexible plastic Nylon naturally slippery, no lubrication required! Runs quieter and smoother Only Nylons should be used for gears where a slippery surface is desired. All other materials (PLA, ABS, PET, etc.) will grind creating a plastic dust and eventually fail! For details, please review all pictures 30 tooth gear O.D.: 2.0" Center bore diameter: 1-5/16" with 3/16" single key way Gear face width: 0.65" (11/16") Do not waste your money on ABS or PLA plastic gear that may strip or even melt! Introductory price - please share installed images and review.