Step drill bits allow you to quickly and easily drill a variety of round holes in steel, brass, copper, aluminum, wood, Plexigla Item No.DescriptionStepsStep length SD10014-12mm5 step5mmSD10024-12mm9 step11mmSD10034-20mm9 step5mmSD10044-22mm10 step5mmSD10054-32mm15 step5mmSD10065-35mm13 step3.5mmSD10075-28.3mm10 step5mmSD10086-18mm7 step5mmSD10095-29mm10 step5mmSD10106-18mm7step5mmSD10116-20mm8 ...