Lump Abradors have a single large diameter rotor, evenly spaced impacting fingers and fixed combs on the side wall. 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 thru. Our lump abradors are top quality.