For Morse taper shank drill bits, the standard continues in 1/64 inch increments up to 1¾ inch, then 1/32 inch increments up to 2¼ inch, 1/16 inch increments up to 3 inches, 1/8 inch increments up to 3¼ inches, and a single 1/4 inch increment to 3½ inches.
https://en.wikipedia.org/wiki/Drill_bit_sizes
Drill Bit Size Conversion Table. Drill bits from zero to one half inch are sized in four ways; fractions, wire gauge numbers, letters, and metric in millimeters. You will see drill bits with a fraction, number, letter or metric number stamped on their shank indicating their size.
http://news.bmotorsports.com/faq/drill-bit-sizes-conversion/
installation on size into square size, which can be used for the installation of the sleeve, is a good accessories to convert. Specification: Size: inch Length. 1/4*1/4*50mm--1/4 shank can be converted into 6.35 mm square. 3/8*1/4*50mm--1/4 shank can be converted into 9.53 mm square.
http://www.amazon.com/Kangnice%C2%AE-Socket-Adapter-Impact-Driver/dp/B00U28JRFO
Drill bits from zero to one half inch are sized in four ways; fractions, wire gauge numbers, letters, and metric in millimeters. You will see drill bits with a fraction, number, letter or metric number stamped on their shank indicating their size.
http://news.bmotorsports.com/faq/drill-bit-sizes-conversion/
For example, this allows a 1/2 bit to be used in a pistol-grip drill's 3/8 chuck. One particular type of reduced-shank drill bits are Silver & Deming (S&D) bits, whose sets run from 9/16 to 1-1/2 drill body diameter with a standard 1/2 reduced shank for all.
https://en.wikipedia.org/wiki/Drill_bit_shank
Lastly, the quick-change shank can be removed from the chuck and the chuck attached directly to most 3/8 powercordless drill spindleswith left-hand threaded screw. Dimensions: chuck diameter 1-5/16, length with quick-change shank 3-1/4 (1-15/16 without) total weight 6.2 oz.
http://www.sears.com/neiko-heavy-duty-3-8inch-conversion-chuck-for/p-SPM9116807013
You can view more details on each measurement unit: inch or mm. The SI base unit for length is the metre. 1 metre is equal to 39.3700787402 inch, or 1000 mm.
http://www.convertunits.com/from/3/8+inch/to/mm
Size: inch Length. 1/4*1/4*50mm--1/4 shank can be converted into 6.35 mm square. 3/8*1/4*50mm--1/4 shank can be converted into 9.53 mm square. 1/2*1/4*50mm--1/4 shank can be converted into 12.7 mm square. Material: Chrome vanadium steel cr-v.
http://www.amazon.com/Kangnice%C2%AE-Socket-Adapter-Impact-Driver/dp/B00U28JRFO
The fractions range from 1/64 inch to 32/64 inch. The numbers range from 107 (smallest) to 1 (largest). Where the number 1 drill bit leaves off the letter A (smallest) begins and continues through the letter Z (largest). The metric sizes are dispersed throughout.
http://news.bmotorsports.com/faq/drill-bit-sizes-conversion/
The fractions range from 1/64 inch to 32/64 inch. The numbers range from 107 (smallest) to 1 (largest). Where the number 1 drill bit leaves off the letter A (smallest) begins and continues through the letter Z (largest).
http://news.bmotorsports.com/faq/drill-bit-sizes-conversion/
3/8 inch shank converted to mm
Three by eight shank is equal to 9.53 millimeter square.