Double cut or Cross cut carbide burrs tend to be used on non ferrous metals, aluminium, soft steel, plastics and hard wood.
Double cut or cross cut (2 flutes cut across each other) will leave a slightly smoother finish than single cut due to producing smaller chips as they cut away the material.
Stay Safe
Always ensure your burr shank is well inserted into your collet and clamped down tightly
Keep pressure light and keep the bur moving focusing on the highest material first
Ensure your work is secured tightly to your work bench
Don't snag or jam your burr into your work
Wear eye protection as a minimum but better still use a full shield for your face