Made from 304 Grade Stainless Steel, these casting flasks feature perforations that allow vacuums to pull unwanted gas through the investment wall. This perforated flask features a cross bar designed to complement the vacuum casting process. Heavy #304 stainless steel resists distortion during heating and cooling, so your flask will last for more casting cycles. Cleans seamless welds and precision-machined surfaces. Compatible with most vacuum casting machines. Measures 5" x 7".