材质：尼龙66
用途：使粗糙的铁孔变成圆滑的出线孔，保护电线及绝缘
| ITEM NO | D | A | B | C |
| SB-8 | 8.0 | 6.0 | 9.3 | 8.1 |
| SB-10 | 9.3 | 6.2 | 12.0 | 10.3 |
| SB-11 | 9.5 | 7.8 | 13.0 | 10.5 |
| SB-13 | 12.8 | 9.2 | 14.6 | 10.3 |
| SB-16 | 15.8 | 12.2 | 18.5 | 10.3 |
| SB-19 | 18.0 | 14.2 | 21.8 | 10.3 |
| SB-22 | 21.8 | 17.2 | 24.2 | 11.6 |
| SB-25 | 25.2 | 18.8 | 28.5 | 11.6 |
| SB-30 | 29.8 | 24.2 | 33.5 | 11.6 |
| SB-38 | 38.1 | 29.0 | 42.1 | 11.4 |
| SB-45 | 44.5 | 35.4 | 47.8 | 11.6 |
| SB-50 | 50.8 | 41.6 | 54.6 | 11.8 |
