If you aren't sure about the size you need, consider investing in a drill bit set with multiple bit sizes. It's also recommended to check the size of the bit, so you don't end up drilling a hole that is too big or too small for the intended purpose. Various drill bits are designed for very specific purposes, such as plug cutter bits and installer drill bits, while other bits have more general use, making them suitable for a wide variety of projects. The type of work should also be a primary factor when you are looking for a new bit. There are also cobalt drill bits to bore through metal, or more general-use products, like black oxide-coated bits or titanium-coated bits. In the U.S., fractional inch and gauge drill bit sizes are in common use. They can be made in any size to order, but standards organizations have defined sets of sizes that are produced routinely by drill bit manufacturers and stocked by distributors. You can find high-speed steel drill bits for wood, fiberglass, PVC, and soft metals, or you can opt for carbide tipped bits for working with tile and masonry. Drill bits are the cutting tools of drilling machines. One of the first considerations should be the type of material you are working with. Drill bushings are specified by ANSI letter-and-number designations, which identify the bushing type and specific dimensions. The ring color represents the color of the depth setting ring found on 1/8 shank drill bits. There are many different factors to consider when it comes time to choose a drill bit. This format consists of one to four letters to identify the bushing type, an OD size in 64ths of an inch, a length size in 16ths of an inch, and the ID of the bushing stated to four decimal positions. The chart below lists the diameters of commonly available cutters.
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