According to Nice classification heading for class 21 states Household or kitchen utensils and containers; Combs and sponges; Brushes [except paintbrushes]; Brush-making materials; Articles for cleaning purposes; Unworked or semi-worked glass, except building glass; Glassware, porcelain and earthenware are include in Class 21. The heading gives you a brief broad overview about what exactly is including in a particular class.
This Class includes, in particular: – utensils and containers for household and kitchen use, for example, kitchen utensils, pails, pans of iron, of aluminium, of plastics or of other materials, small handoperated apparatus for mincing, grinding, pressing, etc.; – electric combs; – electric toothbrushes; – dish stands and decanter stands. This Class does not include, in particular: – certain goods made of glass, porcelain and earthenware (consult the Alphabetical List of Goods); – cleaning preparations, soaps, etc. (Cl. 3); – small apparatus for mincing, grinding, pressing, etc., driven by electricity (Cl. 7); – razors and shaving apparatus, clippers (hand instruments), metal implements and utensils for manicure and pedicure (Cl. 8); – cooking utensils, electric (Cl. 11); – toilet mirrors (Cl. 20).