High speed steel5mm step depth2mm stepsNo pilot hole requiredStepless drillingBurr free drillingNo sheet deformationShank Size 5/16"M1: 4-12mmM2: 4-20mmM3: 4-30mmBlu-Mol Spiral Flute Step DrillPriceFrom $58.96GST IncludedRouter and Drill SizesSelectQuantity*ADD TO CART