closeup of conical step drill bit with spiral flute and blue surface finish on grid net black background

16x9 artistic background beautiful bit black blue borer carpentry closeup coated coating cone conical construction countersunk cutting dark drill drilling edge engineering equipment finishing grid groove hard hardware hole hss industrial industry instrument life machining manufacture mechanical mesh metal metallic metalwork nano net netting nobody part pattern precise quality repair screw sharp single size spare spiral steel step still store surface tech technical technology textile texture titanium tool trade twisted unibit wire working