Final answer:
The best tool to use when giving a flat top haircut is clippers.
Step-by-step explanation:
The best tool to use when giving a flat top haircut is a clippers. Scissors are typically used for cutting longer hair and creating softer looks. Clippers, on the other hand, provide a precise and consistent cut for short hair styles like the flat top. A comb can be used to guide the clippers and create clean lines during the cutting process.