HSS and Titanium Coating - High speed steel makes it more durable than others, titanium coating makes it easy to cut steel plate, aluminum sheet, copper, plastic, metal wood and many other types of sheet metal with ease. Good Design - Hex shank fits into power tool chuck securely and eliminates slippage. Two-flute design removes splinters faster and allows particles to escape easily. It can automatically deburr holes while drilling to keep the bit clean. Split tip increases speed. A necessity for family, DIYer or professionals - Perfect for home repairs and light duty jobs such as drilling holes in plastic, aluminum, copper and many other types of sheet metal. Mengshen titanium coated step drill bit is made made of high speed steel with a titanium coating, which allows a long service life.Features:1. High speed steel for longer life.2. Hex shank prevents slippage in drill chuck.3. The design of double cutting blades allows for faster and smoother cutting.4. X-type openings for easy removal of cutting waste when drilling.5. The sharpness and titanium coating makes it easy to cut through most sheet metal, plastic and other materials.Specifications:Material: High Speed Steel.3 Step Drill Bit Sizes:10 Step Bits 3-12mm.5 Step Bit 4-12mm.9-step bit 4-20mm.Contents:3 drill bits. Note: The data are all manual measurement, please allow 1-3cm error, due to the difference of light and display, there will be some color difference, depending on the physical item received.