Drill America - 29 Piece M35 Cobalt Drill Bit Set in Round Case (1/16 - 1/2 X 64ths), DWDCO Series

The Drill America DWD29J-CO-PC Qualtech jobber length drill bit set contains 29 cobalt steel drill bits with a gold oxide finish, ranging in size from 1/16" to 1/2" in 1/64" increments. The set comes in a plastic index case with labeled compartments for easy identification and organization. These drill bits conform to American National Standards Institute (ANSI) standards.

The self-centering 135-degree split point of these drill bits allows them to penetrate hard materials without the need for a pilot hole, producing smaller chips that reduce clogging compared to a 118-degree point. Cobalt steel provides extended tool life compared to high-speed steel drill bits, maintaining the tool's toughness and hardness even in high drilling temperatures. The gold oxide finish acts as a lubricant and provides wear resistance, while 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. 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 brings chips up and away from the cutting edges and allows for coolant to reach the cutting edges.

Jobber length twist drill bits offer a good compromise of length and reach, allowing them to work with a wide 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, helping to reduce the chance of deflection or breakage when drilling.

Reduced shank drill bits (also called Silver and Deming drill bits) have a shank that is smaller in diameter than their shaft, allowing drilling machines with either a 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, while extra long twist drill bits (also called extension) are even longer for greater reach or for drilling deeper holes.

Drill America, founded in 1927 and headquartered in Miami, FL, manufactures a variety of cutting tools, including drill bits, taps, dies, counterbores, countersinks, end mills, and reamers.

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