คำอธิบาย
| Model | Square plug (PT) |
| ST3151x2 | 1/8″x1/8″ |
| ST3151x4 | 1/4″x1/4″ |
| ST3151x6 | 3/8″x3/8″ |
| ST3151x8 | 1/2″x1/2″ |
| ST3151x12 | 3/4″x3/4″ |
| ST3151x16 | 1″x1″ |
| ST3151x40 | 1 1/2″x1 1/2″ |
| ST3151x50 | 2″x2″ |
| Model | Square plug (PT) |
| ST3151x2 | 1/8″x1/8″ |
| ST3151x4 | 1/4″x1/4″ |
| ST3151x6 | 3/8″x3/8″ |
| ST3151x8 | 1/2″x1/2″ |
| ST3151x12 | 3/4″x3/4″ |
| ST3151x16 | 1″x1″ |
| ST3151x40 | 1 1/2″x1 1/2″ |
| ST3151x50 | 2″x2″ |