Macsim Clever Tool Metal Drill Bits Pre-Drill 12G is a tool that is often used to pre-drill holes in wood, the material which is first inserted into the drill. This product can be used for any type of deck and woodworking. The drill bits have a standard head screw for a quick change to your drill bit driver. HSS Parabolic Bits are used in this product, which means faster drilling and more durable material. - Macsim Clever Tool Metal Drill Bits Pre-Drill 12G12G Standard Head Screw - Pre-drilling and Countersinking Tool for decks and woodworking - HSS Parabolic Bits for faster drilling - For use with 12G standard head screws