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HMA-191 Disc Inserts for 4in Concrete Cylinder Mold are used together with HMA-190 Cylinder Saver Liners for 4in Concrete Cylinder Mold and help to easily remove molded cylinders from HM-146 4x8in Plastic Reusable Concrete Cylinder Molds. Disc Inserts are reusable and come in package of 36.
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