Cleveland 2410 High Speed Steel Taper Shank Drill Bit, Black Oxide, #1 Morse Taper Shank, 135 Degree Split Point, 1/4" Dia. x 6 1/8" Lg (Pack of 1) With 30 degree helix With 135 degree drill point, allowing for a cleaner drill hole and less slippage when starting High-speed steel tools are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance Black oxide treatment adds lubricity and creates small pockets on the surface of the tool that act to hold coolant near the cutting edge Morse taper shank allows the tool to be inserted directly into the machine's spindle to facilitate high-torque applications such as large cut diameters Made in the USA