A builder uses lots of small tools too. He uses a spirit level, which is a tool to make sure something is completely horizontal or vertical. A tape measure is a long flexible ruler which winds up into a small metal casing, and is to measure things. A bigger tool he might use is a pneumatic drill which is a tool about one metre high that drills down into concrete to break it up. it is very noisy, so builders use ear protectors to cover their ears and muffle the loud noise. To stop people walking where builders are working a cone is used,which is a brightly coloured plastic marker that looks like an ice cream cone. They also use a hard hat,which is a hat that covers most of the head and is made out of strong plastic so that if something falls it won't damage their head. To make sure people don't walk in the way of a piece of machinery people wave a flag, which is a piece of brightly coloured material on a stick. The man who waves it is called a linesman.