Chicago Latrobe - 150D Series High-Speed Steel Jobber Length Drill Bit Set, Uncoated (Bright) Finish, 20-piece, #80 - #61

The Chicago-Latrobe 150D series jobber length drill bit set contains 20 high-speed steel (HSS) drill bits, including one each of wire gauge sizes #80 through #61. These drill bits feature an uncoated (bright) finish and a 118-degree conventional point, making them suitable for use in a range of general-purpose applications, particularly on soft metals. The HSS material provides hardness for wear resistance, while the uncoated finish offers an untreated surface.

Jobber length drill bits, the most common type, offer a versatile mid-range drilling depth that is well-suited for a wide variety of general-purpose drilling tasks. The round shank of these drill bits accommodates most standard drill chucks.

The set comes packaged in a gray epoxy-coated steel index case, which features labeled compartments for easy identification and organization. The case measures 5 x 3 x 5/16 inches (H x W x D).

Drill bits are cutting tools used to create holes in various materials, such as wood, metal, and plastic, through the use of machines like handheld portable drills, machining centers, and lathes. The most common type of drill bit is the twist drill bit, which features a round, twisted shaft with two cutting edges and flutes. The helical twist of the flutes helps to bring the chips up and away from the cutting edges, while also allowing coolant to reach the cutting surfaces.

In addition to the standard jobber length, twist drill bits come in several other configurations. Mechanic's length (or maintenance length) twist drill bits are slightly shorter than jobber length and are less prone to deflection when drilling. Short length (or stub/screw-machine length) twist drill bits are the shortest and stiffest, helping to reduce the risk of deflection or breakage during drilling. Reduced shank (or Silver and Deming) drill bits have a shank diameter smaller than their shaft, allowing larger holes to be drilled in materials using a 1/2" or 3/4" drill chuck. Long length (or taper length) twist drill bits are slightly longer than jobber length, enabling deeper holes and longer reach. Finally, extra-long (or extension) twist drill bits are longer than the long length variety, providing even greater reach or the ability to drill deeper holes.

Chicago-Latrobe, a company founded in 1890 and headquartered in Clemson, South Carolina, manufactures a wide range of cutting tools, including drill bits, reamers, countersinks, and blanks. The company is ISO 9001 certified, ensuring its products meet international quality standards.

This Chicago-Latrobe 150D series jobber length drill bit set includes 20 drill bits, one each of wire gauge sizes #80 through #61, packaged in a durable steel case. The HSS material, uncoated finish, and 118-degree conventional point make these drill bits suitable for use on a variety of materials, particularly soft metals, in general-purpose drilling applications. The jobber length provides a versatile mid-range drilling depth, and the set is made in the USA.

product information: