Knoweasy 3Pcs High-Speed Steel Step Drill Bit Set with Automatic Spring Loaded Center Punch,4-12mm/4-20mm/4-32mm Drill Bits Set for Sheet Metal Hole Drilling

✅【Quality Material:】HSS 4241 & classic high speed steel with titanium coating for strength and longevity. ✅【Titanium Coating:】Coated by titanium,this step drill set performs well in heat,corrosion and rust resistance. ✅【Advantage:】Come with an automatic,high-impact,spring-loaded strike when pressed against surface,adjustable cap regulates striking force. ✅【Application:】Perfect for home repairs and light jobs such as drilling holes in plastic,aluminum,copper,iron sheet and many other types of sheet metal (excluding steel or any other harder metal. ✅【Product Guarantee:】Your customer satisfaction and 12 months warranty of step drill kit can be guaranteed.