Division 4 Principal dimensions
United Kingdom
The borers shall conform to the dimensions (subject to a tolerance of 10 %) given in the table below:
| (in mm) | ||
| Type A Long | Type B Short | |
|---|---|---|
| Length of blade | 800 | 400 |
| Thickness of metal of blade | 1 to 2 | 1 to 2 |
| Inner diameter of blade at point | 18 | 32 |
| Inner diameter of blade at grip or stem | 22 | 28 |
| Slit width at point | 4 | 20 |
| Slit width at grip or stem | 14 | 14 |