KEIL 302 501 110 Metal drill bits HSS assortment DIN 338 ground, split point, 19-piece Ø 1.0-10.0 mm increasing by 0.5 mm, in RoseBox (tool)
So far I have always bought at the hardware store HSS drill, knew nothing better. Now I have often drill in aluminum model and then had more square holes, as round. Nachem I had a little information, I realized that one can not obtain a reasonable re