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Thanks to studies carried out with the most prestigious international tube manufacturers, GTC can produce untwisters to eliminate the inner welding cord. Together with untwisters covering a wide range of tubes, from ¾” to 4” in diameter, we produce marker holder mandrels and relative attachments on fin-pass cages. GTC can also design and create specific equipment; like special rods due to high diameter fin-pass or mandrels with special steels making the group strong and lasting, suited for small tubes. And, changeover by just replacing a single element, to speed up the change itself and with no need to dismantle the group completely.