Check the listing for details. Logan 9, 10, 11 inch lathe 30 tooth threding change Nylon gear 5/8" bore US made. Condition: New. Listed at 16.86 USD. 9" , 10" & 11" Lathe 30 tooth Nylon gearThis fine Nylon gear has improved design for better durability and performance compare to OEM and superior to other replacements Made out of Nylon - tough and flexible plasticNylon 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 DP: 16 30 tooth gear O.D. : 2" Gear face width: 7/16" 0.4375" Center bore: 5/8" (0.625"), 5/32" keyed 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.