Designed specially for the Rio Grande Cast-In-One™ casting machine, this clear plastic investing sleeve has a 3-1/2" diameter and fits into the 3-1/2"-dia. rubber base. Insert the sleeve fully into the base, ensuring a secure, leak-free placement. As you build your tree make sure that the wax patterns allow at least 1/4" clearance between the wax and the interior wall of the sleeve. To remove the sleeve after investing, slit the sleeve lengthwise and simply peel it away from the set investment.