| ASMUSS CODE | NB (mm, inch) | 
|---|---|
| SOPT/015 | 15x½” | 
| SOPT/020 | 20x¾” | 
| SOPT/025 | 25x1” | 
| SOPT/032 | 32x1¼” | 
| SOPT/040 | 40x1½” | 
| SOPT/050 | 50x2” | 
We are currently not running Bob Le Hunt courses in person.
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