Atlas MFC Milling Machine 24 Tooth Gear Part # MF-4A This fine Nylon gear has improved design for better durability and performance compare to OEM and superior to other replacements US 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 For the other MFC machine gears please visit: https://www.ebay.com/itm/365356239582 Tooth count 24 DP 24 O.D. : 1.083" (27.5mm) Gear face width: "3/8" (9.52mm) Center bore: 3/8" (9.8mm) Radial Pin hole 1/8"