This is used to assemble various Ø25 and Ø32 mm tube designs such as a rigid handrail, round rail, handhold or awning frame as well as making extenders for the FASTen® accessories. It allows for assembling various tube designs including those in which it is necessary to join two tubes of different diameters. The Inner diameter of the Tt253 assembly allows for fitting a tube with the external diameter of 25 mm whereas the outer diameter is suitable for tubes with the inner diameter of 32 mm.