The power drill is the usual go-to tool for various DIY home projects. It is typically used for drilling or boring holes in wood, metal, plastic, stone, brick, tiles, glass and other surfaces. In the corded power drill, there are a variety of drill bits available in type and size, depending on the material being drilled. We’ll just name some of them:
- High speed steel (HSS) bits – High speed steel bits are the most common types of drill bits. They are ideal for general-purpose drilling through many kinds of materials like wood, plastic and metal.
- Brad point bits – These bits are characterized by the sharp and pointed end of the bit, which is called a brad point tip (or W-point tip). The cutting edges on either side of the point produces a very clean hole. They are specifically made to drill almost all types of wood and they come in variety of lengths and sizes.
- Masonry bits – As the name implies, these tungsten carbide-tipped bits can drill into masonry surfaces such as brick and concrete block. Although masonry bits with cylindrical shanks are common, there are also hexagonal shanks that are typically used by professional handymen.
- Multi-purpose bits – As the name implies, multi-purpose bits can be used to drill into almost every kind of material that include wood, metal, plastic, ceramic and masonry. The tips are specially coated with a diamond ground tungsten carbide.
- Titanium-nitride HSS bits – These bits are four to six time longer than most typical drill bits. The titanium nitride coating at the tip protects the bit from the heat and thus helps in extending its useful life (if used properly, of course).
- Auger drill bits – These bits are characterized by a spiraling shaft and a pointed tip.
- Wood spade or paddle bits – These bits are characterized by a paddle-shaped blade with an extended pointed tip. They are particularly used in drilling bigger holes through wood.
- Metal drill bits – You can tell these bits by their totally black color. Some of the more expensive types are coated with titanium or cobalt. They are typically used to drill through metal, although they can be used on other materials like wood and plastic.
- Countersink bits – These bits drill conical holes for the heads of countersunk screws. They are designed to prevent the wood from splitting or breaking apart.
- Special direct system (SDS) bits – These specialty drill bits are particularly made to fit to a chuck of the SDS drill -- these bits should not be used on any other types of drills. They are particularly designed to handle masonry drilling, and have proven to last longer than the regular masonry drill bits.
The bit is secured by a clamping device called a chuck. Many drills come with keyless chucks which are usually tightened by hand, while other drills come with chucks that need to be secured with keys or other tools, which reduce the likelihood of the larger bits to slip from the machine. Most corded power drills designed for DIY home projects typically come with a ½-inch chuck, but there are also 5/8-inch chucks available. The power ranges from 500 to 800 watts or 650 to 700 watts, depending on the model.
Even with the advent of the lighter and more portable cordless models, corded power drills are still very much around mainly because of the higher power, torque and speed that they provide. Plus, corded power drills are more durable and thus economical to use in the long run. You don't have to deal issues such as the battery that's not working (and therefore needing replacement), like you would encounter with cordless versions. That's why you should include (and keep) a corded power drill to your toolbox.