Atlas Craftsman 10" 12" Lathe 16/32 compound, 24 and 20 tooth reverse tumbler Nylon 3 gear set 1/2" bore no bushing required! US made fine FMD Nylon gear set has improved design for better durability and performance Nylon is a first choice gear material - it is naturally slippery, no lubrication required! Made out of Nylon - tough and flexible plastic Nylon gear set runs quieter and smoother Reduces wear on meshing gears 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. 24t gear outer diameter: 1.625" 20t gear outer diameter: 1.375" Bore diameter 0.5" Gear hub width 0.5" toothed face width: "0.43" 0.5 Overall 10-101-16A 16t gear outer diameters 1.125", face width 0.5" 32t gear outer diameter 2.125", toothed face width: "0.43" overall width 0.5" 16-32 Compound gear Overall width 1" 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.