Also called lunchbox planers, a benchtop thickness planer is a cost effective way to machine lumber to final thickness. Once one face of a board has been flattened with a jointer, use a planer to dress the opposite face parallel to the first, and to a uniform thickness. The infeed roller above the material pulls the wood in and secures it for the cut, then the cutterhead dresses the wood before the outfeed roller keeps downward pressure on the workpiece. A benchtop planer will work well for most hobbyists, and even many professionals. Some models have two speeds, as well as preset depth stops for repetitive cuts at common settings. Most cutterheads contain replaceable (sometimes double-sided) HSS knives. Though expensive, a helical cutterhead produces a smoother surface, especially when working with figured material. All planers are loud.