Industry Leader in Pre-Finished Aluminum Sheet and Coil Alumet Supply is an industry leader in the aluminum distribution business. With multiple service center locations across North America, we service all areas of the US, Canada, Mexico, and the Caribbean. We have earned the reputation of being the "Premier National Supplier" of pre-finished aluminum sheet and coil products. We specialize in pre-painted, pre-anodized and mill finish sheet and coil. Alumet Supply is a division of A.J. Oster LLC. A.J. Oster is North America’s foremost distributor of metal foil, strip and sheet products, and a key part of GBC Holdings, Inc., one of the largest full-service metals companies in the world. A.J. Oster has an extensive product selection, which includes copper and brass alloys, aluminum, stainless steel, carbon steel and antimicrobial copper. A.J. Oster is committed to being a supplier of quality products and service. A.J. Oster provides prompt deliveries and competitive pricing.