1/16" cutting diameter, 3 flutes, single end, ball nose, stub length, TiN coated.
Ground from solid carbide. This tool cuts 1/16" diameter, has 1/8" of flute and measures 1-1/2" 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 stub length keeps the tool short and stiff, which is where you get the least deflection and the best finish.
The TiN coating adds surface hardness and lubricity over uncoated carbide or HSS in general-purpose work.
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More help: Milling TechTips · Troubleshooting · Carbide vs. HSS Guide