| Manufacturing Mode | |
|---|---|
| F | milled |
| V | ground from solid |
| T | rollforged |
Material | |
| HSS | high-speed steel |
| HSS Co | super high-speed steel (5%Co) (HSSE) (Cobalt drills) |
| HSS Co8 | super high-speed steel (8%Co) (HSS E Co8) (HARDOX drills) |
| SK | HSS + sintered carbide tips |
| CHS | case-hardening steel |
| HTS | heat-treating steel |
| CTS | carbon tool steel |
| TiN | HSS + TiN coated |
Grinding Mode (more) | |
| N | conical lip relief |
| A | conical lip relief, split point - form-A |
| B | conical lip relief, split point with rake correction - form B |
| C | conical lip relief, split point - form-C |
| D | conical lip relief with bevelled outer corners - form D |
| E | point angle 180° with centre point - form E |
| M | flat lip relief |
| S | special grinding |
Twist drills - Definition (more) | |
| ε | Point angle |
| λ | Helix angle |
| L | Overall length |
| l | Flute length |
| Note that for other tools drawings are provided at their respective detail pages | |
Surface Treatment of Tool | |
 | without treatment |
 | black oxide coated or steam tempered |
 | black oxide coated or steam tempered - two-coloured execution |
 | TiN-coated |
