Machining > Milling > Ball Nose End Mills | Bordo Long Ball Nose Threaded HSS Slot Drill - Imperial | Bordo Long Ball Nose Threaded HSS Slot Drill - Imperial | HSS-Co8 (Cobalt) centre cutting, long threaded, ball nose. | Sometimes referred to as ball cutters, or ball nose end mills. | For general milling operations - creating slots and cavities. | Commonly used when milling soft steels and non-ferrous materials that produce large chips. | Fewer flutes are best for chip evacuation, keeping the bit cooler, but leave a rougher surface finish.