مثقاب-مقابس، 90 درجة، شفرين، كوبالت، أحجام فردية

These cobalt flutes cut through aluminum like butter, and I love using one to chamfer edges after a rough cut. The 90-degree groove is a nice bonus for quick alignment work.

The 90-degree point on these drill-mills makes a perfect spot for my center drills without walking, and they leave a clean chamfer on aluminum edges. I've been using one to cut a precise groove for a jig, and it holds up well through several passes.

Cobalt holds an edge way longer than the HSS ones I’ve burned through, and the 90-degree point makes spotting holes a quick, accurate step. Used it on aluminum for chamfering and it left a smooth finish without chatter.