Strange dimensions

 From:  Jfs (PAQUICINNO)
10893.1 
Hi, when i mesure with dims, the tube is 2744.3 millimeters, same in the detail window. when i clic on the style name, it is 3018.704 millimeters ???
Where are these 274.404 millimeters? Any ideas ?
Paquicinno
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