Comparison : Item # 6 x 4 x .230, 6061-T6 Aluminum Alloys - Wide Flange
Item # 6 x 6 x .240, 6061-T6 Aluminum Alloys - Wide Flange
Item # 8 x 5 1/4 x .230, 6061-T6 Aluminum Alloys - Wide Flange
Item # 8 x 6 1/2 x .245, 6061-T6 Aluminum Alloys - Wide Flange
Item # 8 x 8 x .288, 6061-T6 Aluminum Alloys - Wide Flange