Learn how the Komplet K-JC503 Jaw Crusher can help your business, minimize downtime on the project site, and reduce construction and demolition waste. Technical Specifications. The Komplet K-JC503 is a lightweight tracked mobile crusher with jaw-crushing action. It can crush and process numerous types of stone materials and construction and demolition (C&D) waste, such as concrete, brick, sandstone, gypsum, and natural stone.