The 515 Tank Tube Series cases are a lightweight, ultra durable option for those odd shaped parts that are long and skinny but need heavy duty protection during transit. These cases are available in 8″, 12″, and 15″ diameters. Casters are available for all models. Don’t see the length you need? No problem, just tell us what you are looking for and we can custom cut the length for you! Look for the Ribs to be sure it’s a Tank Tube!