Anfrere Unique 5PCS Step Bits Set, 50 Sizes HSS Titanium Step Drill Bits, 1/8″-1-3/8″ High Speed Steel Unibit Drill Bits Set for Sheet Metal with Storage Case, Multiple Hole Stepped Up Bits Home Tools

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High Speed Steel: The ladder drilling group performs well in heat resistance, corrosion resistance and rust prevention. The high speed steel structure ensures high durability.
50 Sizes in 5 Pcs – The step drill bit kit includes 5 standard pieces and a center punch (black) with totally 50 sizes for versatility, enough for your DIY needs