Mety hiovaova kely ireo refy ireo arakaraka ny fitaovana ampiasaina, toy ny vy tsy misy harafesina na aliminioma.
Ity ny tabilao mampiseho ny hatevin'ny vy amin'ny milimetatra sy santimetatra raha oharina amin'ny haben'ny vy mahazatra:
| Laharana fandrefesana | santimetatra | mimetatra |
| 1 | 0.300" | 7.6mm |
| 2 | 0.276" | 7.0mm |
| 3 | 0.252" | 6.4mm |
| 4 | 0.232" | 5.9mm |
| 5 | 0.212" | 5.4mm |
| 6 | 0.192" | 4.9mm |
| 7 | 0.176" | 4.5mm |
| 8 | 0.160" | 4.1mm |
| 9 | 0.144" | 3.7mm |
| 10 | 0.128" | 3.2mm |
| 11 | 0.116" | 2.9mm |
| 12 | 0.104" | 2.6mm |
| 13 | 0.092" | 2.3mm |
| 14 | 0.080" | 2.0mm |
| 15 | 0.072" | 1.8mm |
| 16 | 0.064" | 1.6mm |
| 17 | 0.056" | 1.4mm |
| 18 | 0.048" | 1.2mm |
| 19 | 0.040" | 1.0mm |
| 20 | 0.036" | 0.9mm |
Fotoana fandefasana: 04 Jolay 2023