1/4" cutting diameter, 3 flutes, single end, TiAlN coated.
This tool cuts 1/4" diameter, runs a 3/4" shank, has 2-1/4" of flute and measures 4-1/4" overall. The flutes are cut at a 30° helix. The body is tapered at 10°.
Center cutting, so it can plunge straight down before feeding sideways.
TiAlN carries heat away from the edge, which is what lets it run in harder and higher-temperature materials.