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The Chicago-Latrobe 559 series short length drill bit is made from cobalt steel with a gold oxide finish and has a 135-degree split point for penetrating without a pilot hole on ferrous materials. The short length provides rigidity and strength to reduce tool deflection and breakage. Cobalt steel provides extended tool life compared to high-speed steel drill bits, and maintains the tool's toughness and hardness in high drilling temperatures. The gold oxide finish acts as a lubricant and provides wear resistance. The self-centering 135-degree split point penetrates hard material without a pilot hole and produces smaller chips that reduce clogging compared to a 118-degree point. Compared to a standard drill bit, this bit has a thicker web for increased strength and rigidity. 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.
Notabiker
Reviewed in the United States on December 9, 2015
Good quality but you get only one drill but unlike the description that states 12. Drill bit specs .125 x 2" long with flutes @ 1" in length. Works as replacement drill bit for a counter sink/screw driver flip thing for a drill http://www.amazon.com/DEWALT-DW2735P-Drill-Drive-12-Piece/dp/B000051WR8 like this. Mine is kobalt brand fyi
Markus
Reviewed in the United States on October 21, 2015
I received only 1 drill bit. The item description and detailed description indicates that this particular purchase is for a package of 6. Drill bit does not walk at all and rips through steel like a hot knife through butter, but I'd like the additional 5 drill bits that are indicated in the description.
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