l EXTRA HEAVY DUTY CAST IRON CORE
l 1" THICK POLYURETHANE TREAD
l SOLID WEB WHEEL CENTER
l CHEMICALLY & MECHANICALLY BONDED TREAD
l STRAIGHT ROLLER & TAPERED ROLLER BEARING STANDARD
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l P- PRECISION BEARING
l D-DELRIN BEARING
l S-SLEEVE or PLAIN BEARING
l X-NO BEARING
l R-ROLLER BEARING
l T-TAPERED BEARING
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