step drill bit. twisted swarf detail. making hole in aluminum profile

16x9 abstract alloy aluminium aluminum background bit black chip closeup coated coating color copy cutter cutting detail drill drilling edge engineering geometry golden gray high hole hss industrial industry instrument machine machining macro making manufacture manufacturing mechanical metal metallic metalwork nobody nopeople part precision product production profile quality rotate scrap screw sharp shavings shiny silver space speed spin spiral stairstep steel step swarf technical technology titanium tool trade turn turning twisted unibit white work working workpiece workplace yellow