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. It can automatically deburr holes while drilling to keep the bit clean. Good design - Hex shank inserts into power tool chuck securely and eliminates slippage. Twin flute design removes chips faster and allows particles to escape easily. Slotted tip increases speed. A necessity for the family, DIYer, or professionals - Perfect for home repairs and light work such as drilling holes in plastic, aluminum, copper and many other types of sheet metal. Mengshen 3-13mm Step Drill Bit Titanium Coated High Speed Steel Step Drill Bit Hex Shank HSS Professional Pagoda Drill Power Tools High quality material: the drill bit stepped is made of high speed steel with high hardness and good wear resistance. Made of high speed steel with titanium coating to reduce friction and heat, more powerful and durable. Multi-size for Convenience: This unique drill can be used for drill a variety of hole sizes from 3mm to 13mm to meet your different needs, saving you money and more convenience. Wide Application: the hex step drill bit is perfect for cutting holes in a variety of materials including brass, wood, plastic and more in 25 degree hardness and 5mm thick. Titanium twist drill bits are mainly used in wood, plastic and aluminum and M35 twist drill bits are especially suitable for high hardness steel such as stainless steel. Features: Material: 4241 High Speed Steel. Surface Finish: Titanium Coated. Step Size: 3mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm. Hex shank: 6.35 mm. Quantity: 1 piece. Contents: 1 step drill.