Drill America M35 Cobalt Drill Bit Set, 29 Piece, Round Case

The Drill America DWD29J-CO-PC Qualtech jobber length drill bit set comprises 29 cobalt steel drill bits with a gold oxide finish. These drill bits range in size from 1/16" to 1/2" in 1/64" increments. The self-centering 135-degree split point allows for drilling into hard materials without the need for a pilot hole, and it also produces smaller chips that help reduce clogging. Compared to high-speed steel drill bits, cobalt steel provides a longer tool life and maintains toughness and hardness even in high drilling temperatures. The gold oxide finish acts as a lubricant, providing wear resistance during operations. Additionally, the set features a round shank that can accommodate most drill chucks.

For convenient identification and organization, the drill bit set comes in a plastic index case with labeled compartments. These drill bits conform to the standards set by the American National Standards Institute (ANSI).

Drill bits are important cutting tools used with various machines like handheld portable drills, machining centers, and lathes. They are available in different lengths and types, with the twist drill bit being the most common. Twist drill bits have a round, twisted shaft with two cutting edges and flutes. The flutes' helical twist helps in moving chips away from the cutting edges and facilitates the flow of coolant to the cutting edges.

Jobber length twist drill bits, being the most commonly used size, strike a balance between length and reach, making them suitable for a wide range of materials and applications. Mechanic's length twist drill bits are slightly shorter and less prone to deflection. Short length twist drill bits are the shortest and most rigid, minimizing the chances of deflection or breakage while drilling. Reduced shank drill bits have a smaller shank diameter than their shaft, enabling drilling machines with 1/2" or 3/4" chucks to create larger holes. Long length twist drill bits are slightly longer than jobber length bits, allowing for deeper holes and extended reach. Extra long twist drill bits are even longer and suitable for drilling deeper holes or reaching greater distances.

Drill America, established in 1927, is a leading manufacturer of cutting tools including drill bits, taps, dies, counterbores, countersinks, end mills, and reamers. The company's headquarters are located in Miami, FL.

In summary, the set includes 29 jobber length drill bits ranging from 1/16" to 1/2" in size. The cobalt steel construction provides extended tool life for drilling into hard materials, while the gold oxide finish acts as a lubricant and offers wear resistance. The self-centering 135-degree split point allows for efficient drilling without a pilot hole and reduces clogging with small chips. The drill bits meet ANSI specifications and are conveniently organized in a plastic index case. The company, Drill America, has been manufacturing cutting tools for almost a century.

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