These high quality carbide bits are designed for use on Ammco Disc/Drum Lathe models 1000, 1001, 3000, 4000, 4100, 7000, 7700 on-the-car brake lathe models 700,705,710 and drum side on 3850 lathes. Also works on on-the car lathes for FMC/John Bean/Barr