Rio Grande Cast-In-One™ Rubber Base, 76.2 mm

Designed specially for the Rio Grande Cast-In-One™ casting machine, this rubber base holds a 3"-diameter sleeve and is ideal for treeing and investing jewelry models. Insert the Penta-form into the corresponding holes in this base, leaving a gap of at least 1/8" between the Penta-form and the rubber, and you're ready to begin building your tree.