Calculators
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Right Triangle Trigonometry Calculator
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All calculators\charts below courtesy of 
Custompartnet.com
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"The drill size chart provides a list of standard size drill bits in several measurement systems, including fractional, metric, wire gauge number, and letter."
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"The tap size chart provides a list of standard size taps, specifying the diameter and thread spacing, for fractional, metric, and screw sizes. The decimal equivalents of the diameters are shown in both English and Metric units."
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