This Series O mantle is a hemispherical style, meaning it covers only the bottom half of the flask. This allows full view of the flask contents. The mantle accommodates single- and multi-neck flasks Fabric exterior provides effective heating in a space saving configuration Fabric interior to softly nest glass vessels to reduce the chance of thermal shock and damage to glassware Withstands 400°C internal operating temperature Ideal for bottom holes, viewing ports, and other tubulations All 115 volt units are CSA certified Item Weight 15.5 ounces Manufacturer Glas-Col Item model number 100A O396 Package Dimensions 6 x 5.9 x 4.7 inches Is Discontinued By Manufacturer No