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Specialty Products Sure-Sleeve P-3060 3 deg Taper Hole Form$1.69
"OCM Inc's Concrete Sleeves are injection molded from high strength yet flexible polyethylene. They save labor, because they are tapered and can easily removed after the forms have been stripped. OCM Concrete Sleeves may be telescoped or cut to accomodate " | 3In X 8In Concrete Sleeve