Comparison : Item # 10,102, Aluminum 6061 T6511 Square Bar 0.25x12"
Item # 10,103, Aluminum 6063 T52 Square Bar 0.25x12"
Item # 10,104, Aluminum 6061 T6511 Square Bar 0.25x24"
Item # 10,105, Aluminum 6063 T52 Square Bar 0.25x24"
Item # 10,106, Aluminum 6061 T6511 Square Bar 0.25x36"