This steel cutter has a concave cone shape.
Cup burs have cutting flutes on the inside of their cup-shaped heads for rounding wire ends and refining prong tips and rivet heads. Because they tends to clog easily, they should always be used with lubrication.
Fast cut cup burs have unique blade design that allows for faster cutting and assuring longer life for the bur and more production for the jeweller.
3/32" shanks.
