Both single and double-cut carbide burrs come in a variety of sizes and shapes. Ideally, it’s best to get a set of burrs that includes different shapes and sizes, so that you can have the right tools for a variety of jobs. The size of the carbide burr will impact the speed at which it works. You can test different speeds for individual jobs
The two most common cuts of carbide burrs are single and double. Single cut—or one-flute burrs—have a spiral flute, sometimes called an upcut. Single-cut carbide burrs are typically used for milling, deburring, and cleaning of ferrous metals, stainless steel, cast iron, and hardened steel. Double-cut carbide burrs have two flutes. They are sometimes referred to as diamond-cut or crosscut. Typically, double-cut carbide burrs create a smoother finish and can be used on ferrous and non-ferrous metals. They are also used for any non-metal materials, like wood, plastic, and ceramics. Matching the appropriate cut to the job will ensure you get the finish you want without damaging the material.