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<p>Twist drill bits cut using their point and spread the load from the center outward. Different twist drills are recommended based on the application (Twist Drill Bit Guide). The guidelines below are recommended for proper drill use and care. Never use a twist drill to ENLARGE an existing hole - a reamer is the proper tool for this application.</p><br>
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<h2 itemprop="name" style="font-size:15px">Bit Types – How to Choose the Right Drill Bit</h2>
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<th>Drill Bit Type</th>
<th>Description</th>
<th>Usage</th>
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<td>Carbide Drill Bits</td>
<td>DEWALT carbide tip design maximizes carbide surface contact for longer bit life</td>
<td>For use in power drill and electric rotary hammers</td>
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<td>Jobber</td>
<td>The most common type of twist drill bit - Shank diameter is equivalent to point diameter</td>
<td>For use in a drill press, power drill, lathe, CNC</td>
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<td>Long Boy</td>
<td>12 or 18” Overall Length - For general purpose drilling in deep hole applications where long flute length is needed</td>
<td>For use in power drill</td>
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<td>Screw Machine - “Stubby”</td>
<td>Reduced flute and overall length- shorter length increases rigidity when drilling sheet metal or thin stainless steel</td>
<td>For use in power drill</td>
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<td>Reduced Shank</td>
<td>Reduced shank diameter</td>
<td>For use in applications where power tool drill chuck capacity is limited</td>
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<td>Taper Shank</td>
<td>Drill a wide variety of materials- steel, cast iron</td>
<td>For use in machinery with a taper shank socket and/or arbor</td>
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<td>Taper Length</td>
<td>Longer than standard jobber drill bit - Shank is the same diameter as point diameter</td>
<td>For use in lathes and screw machines</td>
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<td>Left Hand</td>
<td>Left-hand spiral flutes - For use in machinery with left-handed rotation or for bolt/screw extraction</td>
<td>For use in a drill press, power drill, lathe, and CNC</td>
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<td>Carbide</td>
<td>For drilling abrasive or non-ferrous materials like cast iron, aluminum, copper, and bronze</td>
<td>For use in a drill press and power drill</td>
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<td>Double End Sheeter</td>
<td>For drilling sheet metal - A short length adds rigidity for drilling flexible materials</td>
<td>For use in power drill</td>
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<h2 itemprop="name" style="font-size:15px">What Does the Term "Jobber" Mean?</h2>
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<p style="font-size:13px">The general definition of the term "jobber" is “a person or company that buys from manufacturers and sells to retailers”, most commonly used in the 1850-1950 period. At that time, manufacturers were mostly producing general purpose "for the trade" drill bits, not using specialized machining applications to make specific lengths or designs like today. Read more about drill bits here.</p>
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<h2 itemprop="name" style="font-size:15px">What is a Jobber Drill Bit?</h2>
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<p style="font-size:13px">A jobber drill bit has a long length compared to its diameter. The length of the flute is between 8-12 or 9-14 times the diameter of the drill, depending on the drill specifications. </p>
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