บริษัท แสงทวีการไฟฟ้า
| L.B. | L.L. | L.R. | O.T. | หัวงูเห่า |
| 1/2" | 1/2" | 1/2" | 1/2" | 1/2" |
| 3/4" | 3/4" | 3/4" | 3/4" | 3/4" |
| 1" | 1" | 1" | 1" | 1" |
| 1 1/4" | 1 1/4" | 1 1/4" | 1 1/4" | 1 1/4" |
| 1 1/2" | 1 1/2" | 1 1/2" | 1 1/2" | 1 1/2" |
| 2" | 2" | 2" | 2" | 2" |
| 2 1/2" | 2 1/2" | 2 1/2" | 2 1/2" | 2 1/2" |
| 3" | 3" | 3" | 3" | 3" |
| 4" | 4" | 4" | 4" | 4" |
