Super Styrene T-Beam These 330mm (13 inch) beams are available in a variety of sizes: 413-51/3: 1.50mm x 1.50mm x 330mm (0.060\" x 0.060\" x 13\") 413-52/3: 2.00mm x 2.00mm x 330mm (0.080\" x 0.080\" x 13\") 413-53/3: 2.50mm x 2.50mm x 330mm (0.100\" x 0.100\" x 13\") 413-54/3: 3.00mm x 3.00mm x 330mm (0.118\" x 0.118\" x 13\") 413-55/3: 3.50mm x 3.50mm x 330mm (0.138\" x 0.138\" x 13\") 413-56/3: 4.00mm x 4.00mm x 330mm (0.156\" x 0.156\" x 13\") 413-57/3: 5.00mm x 5.00mm x 330mm (0.197\" x 0.197\" x 13\") 413-58/3: 6.00mm x 6.00mm x 330mm (0.236\" x 0.236\" x 13\") 413-59/3: 7.00mm x 7.00mm x 330mm (0.275\" x 0.275\" x 13\") 413-60/3: 8.00mm x 8.00mm x 330mm (0.0312 x 0.312\" x 13\") 413-61/3: 9.00mm x 9.00mm x 330mm (0.0354 x 0.354\" x 13\") 413-62/3: 10.0mm x 10.0mm x 330mm (0.0394 x 0.394\" x 13\")