Description 3pcs 4 12 20 32mm HSS Step Drill Bits Set Spiral Grooved Hole Cutter Specification Product NameHSS Step Drill Bits Set MaterialHigh speed steel ColorBlackTypeStep drill Size4 12mm 4 20mm 4 32mm Quantity3pcs set HSS Step Drill Bits Set SizeStepsShank Diameter mm Approx Overall Length mm Approx 4 12mm5 Steps 4 6 8 10 12mm 6644 20mm9 Steps 4 6 8 10 12 14 16 18 20mm 8754 32mm15 Steps 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32mm 10101Features High speed steel good chip removal ability and durable for use Professional design which makes drilling holes more precise with smoother cutting These drill bits works great in making a smooth clean and perfectly round hole Ideal for using to cut holes in a variety of materials Including steel brass wood plastic etc Package Included 1pc x4 12mm HSS Drill Bit1pc x4 20mm HSS Drill Bit1pc x4 32mm HSS Drill BitNotice 1 Please allow a bit error due to manual measurement please make sure you do not mind before you bid 2 The color may have different as the difference display pls understand More Details