twist drills:size :in metric,from 0.2mm to 20mm size;in ... ,M35,M2(6542),etc fully ground,milled HSS straight shank twist drillStandard: DIN338size :in metric,from 0.2mm to 20mmsize;in ... ,titanium coated,black flute&white edge,amberfimish &black flute,rainbow drills,zirconium coated,black flute&white shankSet:1.5--6.5mm ... /set1.0--13.0*0.5mm:25pcs/set straight shank twist drills