Kaiser Aluminum may not be the biggest aluminum company on the block, but it holds its own in a highly competetive global market. The company operates 10 fabricated product manufacturing plants in the US and Canada. Kaiser manufactures rolled, extruded, and drawn aluminum products to serve customers in the aerospace, engineering, transportation, and general industrial markets. Kaiser manufactures more than 500 million pounds of fabricated aluminum products annually. Diversified metal services center Reliance Steel & Aluminum is the company's largest customer, representing almost 25% of sales, while its top five customers comprise about 45% of its business.