Atlas Craftsman 10" 12" Lathe compound spacer /48 tooth Nylon 1/2" bore no spacer required! US made fine FMD Nylon gear 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. 48t gear outer diameter: 3.25" spacer outer diameter: 1.00" Gear hub 0.5", spacer width: "0.5" 1.00" thick 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.