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Sprue bases listed are for solid and perforated flasks. These rubber sprue bases are designed for tree spruing with multiple pieces on each tree. The round button holds a 5/16" (8 mm) sprue. Used for solid and perforated flasks. Sprue bases assure a leak proof seal when casting. Made of natural rubber.
PRODUCT SPECIFICATIONS
.- Material: Natural Rubber
.- Cylinders Diameter: 3-1/2”
.- Hole Dia. 5/16”
.- The round bottom Holds: 5/16" (8 mm) sprue.
- Used for jewelry making, casting, investing, mold making, silicone or rubber molds and more
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