Mengshen Cobalt Step Bit Spiral Flute 4 12mm, M35 HSS Multi Hole 9 Steps Sizes Hex Shank Counterbore Drilling Cutting Enlarge Stainless Steel Plate Quenching

Much More hardness - M35 High speed steel makes it last longer than others, cobalt ensures easily cut through steel sheets, aluminum sheets, copper & plastic & wood board and many other types of sheet metal with ease. 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. It can automatically deburr holes while drilling to keep the drill bit clean. Split point tip increases speed. 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.