The manufacturing of circles is one of the specialities of Interal T.C. Single tubes, flat, triangle, square, rectangular and elliptical circles. Whatever the required shape, dimension or type, we can supply them. We offer two different lines for maximum interchange ability, the Protruss range and the Intertruss range.


A complete circle is always delivered in parts. The number of parts can be increased or decreased on request of the customer as far as this is technically possible. It is also possible to buy a part of a circle. Interal T.C. circles are always manufactured with great accuracy. This makes it possible to fit a part at any place of the whole. Parts of different circles that have the same size can be interchanged. This enables problem-free replacement of a defective part.


Because we manufacture in-house, we are not only able to react flexibly and quickly, but can

also supply customer-specific or project-specific designs. Our circles of every conceivable shape and size are expertly produced to your exact specifications. You can also call on Interal’s expertise and experience at the initial design stage.

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