Drill bits are designed to cut into a surface to make holes of various sizes. There are many choices when considering specific bit size, and anyone using bits is well advised to be sure they have the right tool for the right job.
Twist Drill Bits - These drill bits are meant for relatively shallow holes. They range in size from 0.05 to 100 mm. Twist drill bits drill holes into tough heat-treated metals such as steel, and even titanium. Twist drill bits are often produced in special forms in order to service specific materials and machinery.
Indexable Drill Bit - An indexable drill bit is used to drill shallow holes. They are made of stainless steel and are mostly used in equipment operated by computer-driven software commands, rather than as individual hand-held tools.
Screwdriver Drill Bits - These bits are made to fit in screwdrivers with rechargeable batteries. They have a hexagonal shank, are great for pilot holes, but are limited by low power. You can expect rechargeable screwdrivers to run out of steam long before any major job is completed.
Masonry Bits - These bits are designed to bore holes into concrete, stone and brick. The tip is made of steel carbide that is connected to a steel bit. The bit sizes range from 4 mm to 16 mm, and it is a good idea to drill into materials in a slow and careful way with this type of bit. If too much speed is used the bit will shatter.
Tile Bit - Tile bits are for drilling ceramic tiles and glass, they have a ground tungsten carbide tip. They can be used with a hand drill, but are best used in a variable speed power drill on a slow speed. When drilling glass, some form of lubricant (i.e. turpentine or white spirit) should be used to keep the tip cool.
Flat Wood Bir - This type of bit drills huge holes, leaving a hole with a flat bottom. They require a strong drill, and provide a deep, flat bottom. This is generally done to allow for a screw or bolt deep inside a wooden construct.