Mengshen Step Drill Bit 4 20mm M35 HSS Co Spiral Groove Hex Shank, Multi functional Drilling Tool Cobalt Counterbore Hole Cutter for Wood Stainless Steel Cutting

Much More hardness M35 High Speed Steel - classic high speed steel with cobalt for proven capability and durability in drilling holes in plastic, aluminum, copper, stainless steel and many other types of sheet metal. Good Design - Hex Shank fits into power tools chuck securely and eliminates slip; two-flute design clears chips faster and allows particles to escape easily. Split point tip increases speed. It can automatically deburr holes while drilling to keep the drill bit clean. You can use water to cooling it when it is work and it can be used for even longer. A necessity for family or handyman or professionals - Perfect for home repairs and light jobs such as drilling holes in plastic, aluminum, copper and many other types of sheet metal, especially for stainless steel plate & quenching steel plate.