Gibraltar straight extension tubes have a 1 1/2" diameter and feature plastic end caps. Build your own Gibraltar rack system to your own exacting specifications. Available in 6 Lengths SC-GPR20 - 20" (51cm) SC-GPR30 - 30" (76cm) SC-GPR36 - 36" (91.5cm) SC-GPR435 - 43.5" (110.5cm) SC-GPR59 - 59" (150cm) SC- GPR68 - 68" (173cm) Custom lengths can be created using the Gibraltar SC-PCUT Pipe Cutter
