The machine is a pair of roller grinder whose product is rough smashed malt. Its main gadget is its two cylindrical drums with the same diameter. The two drums rotate in opposite directions for generating extruding force and shearing force to smash malt. There are waves / grooves on the drum surface. The malt is sent in the gap between the drums. The opening between the drums can be adjusted according to smashing requirement and size of broken malt grain required for the brewing purpose.