There are multiple factors to consider when shopping for drill bits. These factors include the size of the tool being used, how often the drill bit will be used and the material the bit needs to drill through. Drill bits are made of various materials to assist with your project needs. High-Speed Steel (HSS) drill bits are used for drilling wood, light metals, fiberglass and PVC. Black oxide-coated drill bits are more durable than standard HSS bits and the coating helps the drill bit resist rust. These are best for hardwood, softwood, PVC, fiberglass and steel. Titanium-coated drill bits have reduced friction, require less effort and last longer than black oxide-coated bits. These are best for hardwood, softwood, PVC, fiberglass and steel. Cobalt drill bits are used for drilling hard metal and steel. They dissipate heat quickly and are highly resistant to abrasions, making them better for drilling into hard metals than black oxide- or titanium-coated drill bits. When considering a cobalt drill bit vs. titanium, cobalt bits are usually the best drill bits for stainless steel. Carbide-tipped drill bits stay very sharp over long periods of use and are used mainly for concrete, tile and masonry. These are often the best masonry drill bits for your project. Within Eagle Tool US Drill Bits, the most common material type is Steel.