Casting Flask Perforated Flask is made of 304 Stainless Steel. A Heavy-Duty thick Stainless Steel perforated flask sales used in Lost Wax Casting with Vacuum Chamber.Flask Wall thickness is 1/8" thick and the Ring Flange is 1/4" thick.Specifications:Material: Stainless Type 304Diameter: 4" - 102mmHeight: 4" - 101.6mmWall Thickness: 8gaugeWeight: 2.05Lb.