(Just showing R4) PennDOT Certified. R4 mainly 6” to 12” rock PennDOT Certified. R5 mainly 9” to 18” rock PennDOT Certified. R6 mainly 12” to 24” rock PennDOT Certified. R7 mainly 18” to 30” rock PennDOT Certified. R8 mainly 24” to 42” rock

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