What kitchen tool is used to flatten dough into thin sheets?

The kitchen tool used to flatten dough into thin sheets is a rolling pin.

A rolling pin is a cylindrical utensil rolled across dough to reduce its thickness and create an even sheet. It is used for pie crusts, cookies, pasta, pastries, flatbreads, dumplings, and many other baked or cooked foods.

The two classic designs are the roller and the rod. A roller has a thick central cylinder with handles at each end, while a rod-style pin is a thinner baton held directly in the hands. French-style pins are often tapered, which helps with control and shaping.

Rolling pins come in materials including wood, marble, glass, ceramic, metal, and plastic. A chilled marble pin can help keep pastry dough cold, while a traditional Indian belan is used with a chakla to roll chapati dough. A wine bottle can work in an emergency, but it is less easy to control.