Radius Turning Tool, cut ball-shaped end or turns a radius on lathe, cuts ball-shapes up to 3/4 inch diameter, made of corrosion-resistant blackened steel
Universal Radius Turning Attachment 3/8" Shank With HSS Cutter Lathe B – KavTak Tools
Ball Turning
Radius Ball Turning Tool for Lathe 3/8" Shank with HSS Tool Bit : Amazon.de: Business, Industry & Science