Atlas 618 Craftsman 101 6" Lathe 50 Tooth Nylon Gear, OEM Part # M6-101-50 This fine Nylon gear has improved design for better durability and performance compare to OEM and superior to other replacements Made in US 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 DP: 24 O.D. : 2.1667" (2-1/32") Gear face width: "3/8" (0.375") Center bore: 1/2" (0.5") with 2 key ways 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.