This industry comprises establishments known as hardware stores primarily engaged in retailing a general line of new hardware items, such as tools and builders' hardware. Cross-References. Establishments primarily engaged in-- ? Retailing hardware items via electronic home shopping, mail order, or direct sale--are classified in Subsector 454, Nonstore Retailers; ? Retailing a general line of home repair and improvement materials and supplies, known as home centers--are classified in Industry 444110, Home Centers; and ? Retailing used hardware items--are classified in Industry 453310, Used Merchandise Stores.