1/4" cutting diameter, 2 flutes, ball nose, uncoated.
Ground from solid carbide. This tool cuts 1/4" diameter, has 3/4" of flute and measures 2-1/2" overall.
The ball nose leaves a radiused bottom, which is what you want for 3D contours, fillets and mould surfaces rather than flat floors.
The straight flute takes no helix angle, so it pulls neither up nor down on the work — useful on thin material and in slotting.
Uncoated, so the edge stays as sharp as it can be ground — the usual choice for aluminium and other soft, sticky materials.
Free TechTips resources for end mill users — machinist tested.
More help: Milling TechTips · Troubleshooting · Carbide vs. HSS Guide