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The shortest SDS-plus masonry drill bits are about 110 mm overall length, and the longest 1500 mm. SDS-max is more common for larger rotary hammers and chipping guns, and common sizes start at 1 ⁄ 2 inch (13 mm) diameter up to 1 + 3 ⁄ 4 inches (44 mm) diameter. Standard lengths are 12 to 21 inches (300 to 530 mm).
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 ...
Example (inch, fine): For 7 ⁄ 16-20 (same diameter as the previous example, but this time with 20 threads per inch, which is considered fine), 0.437 in × 0.90 = 0.393 in (i.e., if the threads are to be fine, then a slightly larger diameter drill bit should be used before tapping the hole for the screw).
Flat-blade jeweler's screwdrivers and the tips found in 1 ⁄ 4-inch or 6.4-millimeter drive sets are generally hollow-ground. Note that it is this typical chisel shape which allows 9 screwdriver sizes to drive 24 different slotted screw sizes, with the drawbacks of not fitting as closely as a hollow-ground screwdriver would, and increasing the ...
Indexable bits with the same purpose, to be held either in indexable handles or in power tool chucks, are called nutsetters. A spinner handle is a shaft and handle with a drive fitting—most commonly 1 ⁄ 4 in (6.35 mm) square axle at the end for attaching interchangeable sockets. This allows one to use a single handle with a number of sizes ...
Some companies now offer a modernized version that uses standard 1 ⁄ 4-inch hex shank power tool bits. Since a wide variety of drill bits are available in this format, the tool can do double duty as a "push drill" or Persian drill .
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