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Mar 30 2017 The IROCK Crushers TC-20 Track Impact Crusher combines a large feeder high-performance four-bar impactor and heavy-duty components for exceptional efficiency reliability and precision.. The TC-20 can process soft to medium hard rock as well as recycled concrete and asphalt. The rotor measures 40- x 56-in. and can process a variety of materials up to 24-in. in diameter.