| Worm shaft | |
| Teeth | 2 |
| Outer diameter | 7mm |
| Innner hole | 3mm (fit for 3mm moter shaft) |
| Length | 12mm |
| Worm wheel | |
| Teeth | 20 |
| Outer diameter | 11mm |
| Inner hole | 4mm |
| The total thickness | 12mm |
| tooth thickness | 6mm |
| Round table 8mm, with a M3 top wire | |
| Worm wheel and gear center distance from the center is 8mm | |