1900 DOSKO, 13-21T-13H Chippers / Shredders, Doskos 4" capacity chipper is perfect for landscapers, tree care professionals, government agencies or rental stores. When you choose a Dosko, you choose equipment thats long-lasting and hard working. Engineered durable, youll find Doskos brush chipper to be the longest lasting, easiest to use unit on the market today. Our easy to access components ensure routine maintenance is quick and simple.