Drill bits for metal
For drilling into metals such as stainless steel, your best bet is a HSS twist bit. High-speed steel offers greater resistance to the high temperatures generated when drilling into metal, and the flutes on a twist bit will throw off metal strands that are relatively easy to clean up.
If you’re working with thin material or widening existing holes, use a step bit to get exactly the size you need. For creating holes of one inch or more in metal surfaces, consider a hole saw.
Drill bits for masonry
Masonry drill bits are good for surfaces like concrete, brick or mortar. They’re normally twist bits with a carbide fin at their point. The fin breaks up the masonry, while the flutes on the body remove the waste material.
Masonry bits are often used with a hammer drill, a specialized tool that adds a rapid hammering action to the bit. That allows it to reach fresh masonry and remove dust more efficiently.
Drill bits for wood
The go-to bit for wood is a twist drill bit. A brad point on a drill bit will create a bit of “bite” and help prevent the bit from walking across the surface as you get up to speed. For holes of one inch or more, consider a spade bit.
Many screwdriver designs have a handle with a detachable tip (the part of the screwdriver that engages the screw), called bits as with drill bits. This provides a set of one handle and several bits that can drive a variety of screw sizes and types.