Most popular type & widely used type with only a small loss in effective length.
| DIA | LENGHT | DIA | LENGHT | DIA | LENGHT |
| In mm | In mm | In mm | In mm | In mm | In mm |
| 1.5 | 9.3 | 2.5 | 13.8 | 3.175 | 25.4 |
| 1.5 | 9.8 | 2.5 | 15.8 | 3.2 | 19.3 |
| 1.5 | 11.8 | 2.5 | 19.8 | 3.5 | 15.8 |
| 1.5 | 13.8 | 2.5 | 23.8 | 3.5 | 34.8 |
| 1.811 | 13.46 | 2.5 | 25.8 | 3.967 | 19.05 |
| 2 | 7.8 | 2.778 | 11.17 | 4 | 15.8 |
| 2 | 9.8 | 3 | 9.8 | 4 | 25.4 |
| 2 | 11.8 | 3 | 13.8 | 4.755 | 25.4 |
| 2 | 13.8 | 3 | 15.8 | 5 | 23.8 |
| 2 | 15.8 | 3 | 17.8 | 5 | 29.8 |
| 2.381 | 10.57 | 3 | 18.4 | 5.542 | 19.05 |
| 2.381 | 19.8 | 3 | 19.8 | 6 | 30 |
| 2.381 | 12.55 | 3 | 21.8 | 6.5 | 30.8 |
| 2.381 | 16.85 | 3 | 23.8 | 7 | 30 |
| 2.5 | 9.8 | 3 | 29.8 | 7.25 | 25 |
| 2.5 | 11.8 | 3.175 | 19.05 | 7.5 | 19 |