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High Speed Steel 4241#
【Step Drill Bits Set】Package includes 3Pcs straight flute step drill bit with size 4-12mm, 4-20mm, 4-32mm. 1/4" Hex Shank
【HSS & Titanium Coating】Made of classic high speed steel 4241 and Titanium coated to reduce friction and heat. Easily cut through steel sheets, aluminum sheets, copper & plastic & wood board and many other types of sheet metal with ease
【Two-flute Design】Double cutting blades design gives you faster and smoother cutting, automatically deburrs when drilling holes
【1/4 Inch Hex Shank】Fits into power tools chuck securely and eliminates slip. Widely used to cut holes in a variety of material like steel, wood, thin iron, aluminum alloy,PVC that the thickness is within 5mm
【Working Performance】Suitable for drill, bench drill. Water Cooling during work can effectively extend the service life of step drill bit, recommend drilling rate of 250-400 RPM