Established in 1964, Castle Wholesalers Inc. is an online hardware store selling products to businesses. The company offers products, such as building, paint, plumbing, janitorial and electrical, to name a few. Castle Wholesalers Inc. provides products from manufacturers that include Milwaukee, Dewalt, Porter, Bosch, Channellock and 3M, among others. The company has specializations in areas, such as industrial cleaning supply, wood working tools, plumbing/pipe fittings and paint supplies, including others. Located in Brentwood, Md., Castle Wholesalers Inc. has over 30,000 products in stock.