M35 HSS and Cobalt - M35 high speed steel makes it last longer than others, cobalt ensures easy cutting through steel sheets, aluminum sheets, copper and plastic and metal. wood and many other types of sheet metal with ease. Good Design: Hex shank fits into power tool chuck securely and eliminates slippage; the two flute design cleans up splinters faster and allows particles to escape easily. A necessity for the family, DIYers or professionals - Perfect for home repairs and light jobs such as drilling holes in plastic, aluminum, copper and many other kinds of metal sheet, especially for stainless steel plate and stainless steel plate. It can automatically deburr the holes during drilling to keep the drill bit clean. The split tip increases speed. The M35 step drill bit is made of high speed steel with cobalt, which allows for a long service life. Features : 1. M35 high speed steel for longer life. 2. The hex shank prevents slippage in the drill chuck. 3. The design of double cutting blades allows for faster and smoother cutting. 4. Advanced double spiral flute design outperforms straight flute design and extends bit life. The split tip increases speed, and it also includes laser-etched measurements to increase footstep visibility. 5. The sharpness makes it easy to cut most sheet metal, plastic and other materials, especially for stainless steel plates and steel plates. Features : Material : M35HSS. Step Drill Sizes: 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm. Content : 1 x M35 HSS drill bit. Note: The data are all manual measurement, please allow 1-3cm error, due to the light and display difference, there will be some difference color, depending on the physical item received.