Profile: Mid-America Mfg. Corp. manufactures several products for concrete industry. Our product line includes box culvert mold equipment, dry cast forms, wet cast forms, rollerheads and wear parts, fiberglass rounding rings, wire mesh rollers and shear, wire mesh benders, dry cast feeder system and concrete pipe testers. Our fiberglass rounding rings for concrete pipe are made from acid-resistnat resin and chopped glass fiber. We make these rings with precision machined molds to assure roundness. These rounding rings are available for inside round tongue, outside round tongue, inside round bell or groove.