Montgomery Wards 700 series lathe 30 tooth rear head stock spindle Nylon gear 30 tooth, 1-1/8 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" D.P: 16 Center bore: 1.125" (1-1/8") with 0.156 (5/32") single key way Gear face width: 0.575" (9/16") Part number LA-215-1 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.