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HM-331 Plastic Concrete Beam Mold, Interlocking is constructed of durable copolymer plastic, which is one-fourth the weight of steel and easier to strip and clean. Its ribbed interlocking parts hold dimensions and shape securely while thumb screws allow for easy assembly, stripping and cleaning. The 6x6x21in (152x152x533mm) interior is smooth, and grease or sealant can be used to ensure a watertight seal.
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