Chicago Latrobe 150L High-Speed Steel Jobber Length Drill Bit, Uncoated (Bright), Round Shank, Left-Hand Flute, 118 Degree Conventional Point, Wire Size #1 (Pack of 12)

The Chicago-Latrobe 150L series left-hand (reverse) jobber length drill bit is made from high-speed steel with an uncoated (bright) finish and has a 118-degree conventional point for use in general-purpose drilling applications on a range of materials, especially soft metals. The counterclockwise spin of the left-hand helix can be used for removing broken screws from a threaded hole or drilling in reverse direction. High-speed steel (HSS) provides hardness for wear resistance. The uncoated finish has no additional surface treatment or coating. A jobber length drill bit has a versatile midrange drilling depth and is a common choice for general-purpose applications. The round shank accommodates most drill chucks. Drill bits are cutting tools used to make holes in a range of materials using machines such as handheld portable drills, machining centers, and lathes. Drill bits come in a variety of lengths and types, the most common of which is the twist drill bit. The round, twisted shaft of the twist drill bit typically has two cutting edges and flutes. The helical twist of the flutes brings chips up and away from the cutting edges and allows for coolant to reach the cutting edges. Jobber length twist drill bits, the most common length of twist drill bit, offer a good compromise of length and reach for the widest range of materials and applications. Mechanic's length twist drill bits (also called maintenance length) are a little shorter than jobber length and less prone to deflection when drilling. Short length twist drill bits (also called stub or screw-machine length) are the shortest and stiffest twist drill bits, helping to reduce the chance of deflection or breakage when drilling. Reduced shank twist drill bits (also called Silver and Deming drill bits) have a shank that is smaller in diameter than its shaft, permitting drilling machines with a 1/4", 1/2", or 3/4" drill chuck to create large holes. Long length twist drill bits (also called taper length) are a little longer than jobber length, allowing for deeper holes and longer reach. Extra-long length twist drill bits (also called extension) are longer than long length twist drill bits for greater reach or for drilling deeper holes.Chicago-Latrobe manufactures drill bits and accessories, reamers, countersinks, and blanks. The company, founded in 1890 and headquartered in Clemson, SC, meets International Organization for Standardization (ISO) standard 9001.

• General-purpose for working on carbon steel, alloy steel and cast iron. Left-Hand jobber length drill. High-speed steel tools are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance. Round shanks allow use with a wide variety of toolholding systems.
• General-purpose geometry for drilling in a wide range of operating conditions and materials
• Manufactured from premium high-speed steel, 118 degree point
• Left-hand helix is ideal for use in screw machines where machine spindle rotation is counter-clockwise
• Can substitute for screw extractors to remove broken parts without damaging threaded holes. Uncoated tools feature just the base substrate without any additional treatment or coatings and are suitable for a wide range of applications