ATLAS CRAFTSMAN 10 12" Lathe slow feed half speed Nylon Gear This fine Nylon gear has improved design for better durability and performance It is superior to other plastics 3D printed replacements Nylon is a first choice gear material - it won't create plastic dust as ABC does! 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 May fit other 1/2" bore lathes as well. 20t gear outer diameter: 1.25" 40t gear outer diameter: 2.5" Gear face width: "0.5" (40t gear) + 0.5" (20t gear) = 1" Overall Center bore: 1/2" (0.5") DP: 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.