A2Z Tuff Nut T-nuts & (1) T-slot cleaner for Sherline Lathes Custom designed to fit all Sherline & Headstock t-slots of Sherline Mills. Tuff Nuts are Black Oxide Mil spec finish for durability. Tuff Nuts are machined from 12L14 steel in our own plant on production Haas CNC equipment. Threaded for 10-32 studs (studs not included). Lifetime warranty on T-Nuts. If one breaks, return it, we will replace it with two (2) Tuff Nuts.