TIPI DI SEZIONE DI CANNELLO

1 – Round stem 2 – Oval stem 3 – Vertical oval stem
4 – Square stem 5 – Square stem 6 – Triangular stem
7 – Triangular stem 8 – Oval square stem 9 – Vertical oval square stem
10 – Exagonal stem 11 – Octagonal stem 12 – Round square stem