Zviyero izvi zvinogona kusiyana zvishoma zvichienderana nechinhu chaicho chiri kushandiswa, senge simbi isina tsvina kana aluminium.
Heino tafura inoratidza ukobvu chaihwo hweshizha simbi mumamirimita nemainch zvichienzaniswa negeji saizi:
| Geji Nha | Inch | Metric |
| 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 |
Nguva yekutumira: Jul-04-2023