Chicago Latrobe 69881 150L Left-Hand Flute High-Speed Steel Drill Bit Set, 15-Piece

This set of jobber length drill bits, designed by Chicago-Latrobe in their 150L series, features 15 high-speed steel (HSS) bits specifically crafted for left-hand (reverse) operation. These bits range in size from 1/16 inches to 1/2 inches in 1/32-inch increments. They showcase an uncoated (bright) finish and include a 118-degree conventional point, making them ideal for drilling various materials, particularly soft metals. The left-hand helix spins counterclockwise, providing unique advantages such as the ability to remove broken screws from threaded holes or drilling in reverse.

Constructed from high-speed steel, these bits offer excellent hardness and wear resistance. The uncoated finish, an untreated surface, allows for flexibility across different applications. Jobber length drill bits, which feature a versatile midrange drilling depth, are commonly chosen for a wide variety of drilling tasks. The round shank design fits most drill chucks seamlessly.

This set is conveniently housed in a gray epoxy-coated steel index case that features labeled compartments, helping users identify and organize the bits efficiently. The dimensions of the case measure 7-3/8 inches in height, 4-1/4 inches in width, and 1-1/4 inches in depth, offering a compact yet organized storage solution.

Drill bits, essential cutting tools, are used to create holes in a myriad of materials through machines like handheld drills, machining centers, and lathes. Among the numerous types available, twist drill bits are the most prevalent, characterized by their round, twisted shafts that typically feature two cutting edges and flutes. The helical twist of the flutes effectively channels chips away from the cutting edges while also allowing coolant access, enhancing performance.

The jobber length twist drill bits provided in this set represent the standard length, striking a balance between length, reach, and usability for a broad spectrum of materials and tasks. Conversely, mechanic’s length twist drill bits are slightly shorter, reducing deflection risk during drilling. Short length bits, also known as stub or screw-machine length, minimize deflection and breakage risks thanks to their additional stiffness.

Additionally, reduced shank drill bits, known as Silver and Deming drill bits, feature a smaller shank diameter than their shaft, enabling drilling machines with 1/2-inch or 3/4-inch chucks to produce larger holes. Long length twist drill bits provide greater reach and deeper hole options, while extra-long twist drill bits, or extensions, surpass long length bits, catering to deep drilling needs or extended reach.

Founded in 1890, Chicago-Latrobe is a manufacturer of drill bits and accessories, including reamers, countersinks, and blanks, with its headquarters located in Clemson, SC. The company adheres to the International Organization for Standardization (ISO) standard 9001, ensuring quality and consistency in its products.

What's Included in the Box: - 15 drill bits spanning inch sizes from 1/16 inches to 1/2 inches, in 1/32-inch increments - A durable steel case for organized storage - Left-hand helix design for reverse drilling and screw extraction - HSS construction for durability and wear resistance - Versatile uncoated finish suitable for various materials, particularly soft metals - 118-degree conventional point optimized for diverse drilling applications - Proudly made in the USA.

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