cone step drill bit with blue nano coating on curled wood shavings pile

16x9 beautiful beige bit blue borer boring brown building carpentry chip closeup coated cone conical construction curled cutter cutting different drill drilling edge engineering equipment finishing fluted groove hard heap hole hss industrial industry instrument joinery machining macro mechanical metal metallic nano nobody nopeople pile precise profile quality sawdust scale screw sharp shavings shiny single size spiral stairstep steel step surface technical technology texture titanium tool trade treatment turning twisted unibit wood wooden woodwork working