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Drill America 29 Piece High Speed Steel Drill Bit Set in Round Case (1/16" - 1/2" X 64ths), DWDN Series
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About Drill America 29 Piece High Speed Steel Drill Bit
The Drill America DWD29J-PC Qualtech jobber length drill bit set contains 29 high-speed steel drill bits with black oxide finish in inch sizes 1/16" to 1/2" (1/64" increments). The bits have a 118-degree conventional point for use in general-purpose applications. High-speed steel (HSS) provides hardness for wear resistance, and a black oxide finish reduces wear while promoting chip and coolant flow. The round shank accommodates most drill chucks. The set comes in a plastic index case with labeled compartments for identification and organization. Drill bits conform to American National Standards Institute (ANSI) standards.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 to work with 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 drill bits (also called Silver and Deming drill bits) have a shank that is smaller in diameter than its shaft, permitting 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 lo
