6061-T6 Aluminum sheet is made from one of the most widely used heat treatable aluminum alloys. This sheet has excellent corrosion resistance, good workability and good machinability. Material: AluminumShape: SheetAlloy: 6061Temper: T6Thickness: 0.040 inchSheet Size: 24 inches x 48 inchesFinish: Unpolished (Mill)Notes: INFORMATION ABOUT THIS PRODUCT: Mill finished aluminum sheet may contain minor surface scuffs or scratches from handling and shearing operations. This will be mainly on the down side surface where the material has been handled for shearing to size. We do our best to keep this to a minimum, but some can be expected. Length and Width Tolerances are: (plus or minus 1/16 inch from listed size.)