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2. Drill bit shank - Wikipedia

   en.wikipedia.org/wiki/Drill_bit_shank

   Large drill bits can have straight shanks narrower than the drill diameter so that they can be fitted in chucks not able to chuck the full diameter. Such a drill bit is called a reduced-shank or blacksmith's drill. For example, this allows a 1 ⁄ 2-inch (13 mm) bit to be used in a pistol-grip drill's 3 ⁄ 8-inch (9.5 mm) chuck.

3. Drill bit - Wikipedia

   en.wikipedia.org/wiki/Drill_bit

   3.9 Straight fluted bit. 3.10 Trepan. ... (3/4 inch) center bit, made sometime before 1950 ... which extends only about 1 ⁄ 2 in (13 mm) up the shank before ending ...

4. Bit shank - Wikipedia

   en.wikipedia.org/wiki/Bit_shank

   A classic "Santa Barbara" style bit shank, designed for western riding and decorated with silver for use at horse shows. The bit shank is the side piece or cheekpiece of a curb bit, part of the bridle, used when riding on horses. The bit shank allows leverage to be added to the pressure of the rider's hands on the bit. Shanks are usually made ...

5. Router (woodworking) - Wikipedia

   en.wikipedia.org/wiki/Router_(woodworking)

   Bits also differ by the diameter of their shank, with 1 ⁄ 2-inch, 12 mm, 10 mm, 3 ⁄ 8-inch, 8 mm and 1 ⁄ 4-inch and 6 mm shanks (ordered from thickest to thinnest) being the most common. Half-inch bits cost more but, being stiffer, are less prone to vibration (giving smoother cuts) and are less likely to break than the smaller sizes.

6. Drill bit sizes - Wikipedia

   en.wikipedia.org/wiki/Drill_bit_sizes

   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. One aspect of this method of sizing is that the size increment between drill bits ...

7. Machine taper - Wikipedia

   en.wikipedia.org/wiki/Machine_taper

   The shank is short (about half as long as other machine tapers), with a shallow taper, the shank is 1:9.98 and the receiver is 1:10, [15] and slightly too large to allow the flange to seat fully in the socket. The thin walls, short shank and shallow taper provide a large opening in the back of the tool.