TiN Coated Cobalt Knurling Wheels (SW4 Series) Dorian SW knurling wheels are technically designed to knurl against a square shoulder. Super precise workmanship, made of heat-treated high cobalt steel to withstand severe knurling operations. The wheels are titanium nitride (TiN) coated to reduce the coefficient of friction when knurling, increasing knurling quality and force, as well as tool life. Made in USA.
