These products are applicable to connect the circular wire and hemicycle-sector GL series hole-passing connection tube is made of L3 aluminium tube.
| TYPE | D | d | L |
| GL-1-10 | 9 | 5 | 52 |
| GL-1-16 | 10 | 6 | 56 |
| GL-1-25 | 11 | 7 | 62 |
| GL-1-35 | 12 | 8 | 67 |
| GL-1-50 | 15 | 10 | 76 |
| GL-1-70 | 17 | 11 | 87 |
| GL-1-95 | 19 | 13 | 92 |
| GL-1-120 | 21 | 15 | 98 |
| GL-1-150 | 23 | 17 | 108 |
| GL-1-185 | 25 | 19 | 114 |
| GL-1-240 | 28 | 21 | 118 |
| GL-1-300 | 34 | 24 | 135 |
