Middleby SDR-42 is a dough roller designed for commercial use in pizzerias and other foodservice establishments. It is capable of rolling dough into sheets of various thicknesses, ranging from 1/16" to 1/4". The machine has two sets of rollers, an upper and a lower set, which can be adjusted independently to achieve the desired thickness. The upper rollers are spring-loaded to ensure even pressure distribution, while the lower rollers are fixed in place.