Lump breakers are available as either low or high speed devices in the form of hopper or chute feed or as pipeline versions. The breakers are made in a range of sizes in single or twin shaft arrangements. The twin shafts machines contra-rotate, to draw lumps into the central breaking zone, providing a self cleaning action, thereby permitting the breaker to smash larger and denser lumps without bridging or clogging. Standard construction for the body section is in mild steel, with abrasion resistance breaker bars. Low speed versions are for gentle crushing duties on brittle products that require breaking down without the generation of excessive dust and fines. High speed breakers are more destructive of the granular materials, combining the effect of impact, wedging and trapping at a rapid rate, to fracture the chunks into a wide range of particulate fractions.