The Basic Rotary Bit Set is a perfect set to help you get started into power carving. The two green cutters are made out of carbide and are designed to remove wood quickly. The fluted carbide bits can still remove a fair amount of material but leave a much cleaner cut. The diamond bit set is used to help you clean up your carvings and to add some of your final details. These bits are designed to last and to help you have a better idea of the different types of cutters that are available. (Bits may not be exactly what is pictured. Substitutions of a similar bit may be required based on availability). All burs have a 1/8" shank.