Lump abradors have a single large diameter rotor, evenly spaced impacting fingers and fixed combs on the sidewall. The blades intermesh with the breaker bars, acting as a series of crushing hammers. Particles smaller than the breaker bar slots continue through the machine while larger particles are trapped within the impact area, which continue to be crushed until small enough to flow through. It is constructed of carbon steel, stainless steel, sanitary stainless steel and other alloys.