This Pyrex steamer is designed for top of stove or microwave steam cooking. It has a pierced glass base, large handles for safe and easy handling and is 100% food safe. Made of tempered borosilicate glass it has a thermal shock resistance of 220 degrees and can be used from as low as minus 40 degrees up to 300 degrees. A shape essentially designed to fit on all standard casseroles and stewpots. Steamer features: Size H8, diameter 20cm. Dishwasher safe. General information: Weight 1.15kg. Manufacturers 10 year guarantee.