1. Ko te Mata Hama tētahi o ngā wāhanga nui o te mira hama, ka pupuri i te mahi pai o te mira hama, engari he wāhanga mau hoki.
2. E whakamahia ana te rau mata i roto i te mira hama me te hanganga ngawari me te watea o te whakaputa, ko te mata porotaka te mea e whakamahia whānuitia ana i roto i te umanga.
3. He pānga nui tōna ki te mīhini huri. He pānga tika te kōhao me te kounga o te mata ki te whai huatanga o te tirotiro me te roa o te wā e mahi ana te mata.
4. Ko te rahi o te kōhao e rite ana ki te rahi o te pire. Ka taea te tukatuka hei momo kōhao, pērā i te 0.6mm, 0.8mm, 1.0mm, 1.2mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm, me te 4.0mm.
Ka taea e mātou te whakarato i ngā mata mira hama o ngā rahi rerekē. Mēnā he hiahia tōu ki tētahi o ēnei taonga, tena koa whakamōhio mai. Ka koa mātou ki te tuku atu i tētahi utu whai muri i te whiwhinga o ō whakaritenga taipitopito. Kei a mātou anō ā mātou ake miihini R&D ngaio hei whakatutuki i ngā whakaritenga katoa.
| Matotoru (mm) | Te whānui o te kōhao (mm) | Ōwehenga o te Rohe Pū | Te Manawanui ki te Diameter o te Kōhao | Te Manawanui ki te Diameter o te Pokapū Kōhao |
| 1.0 | 1.0 | 20% | ±0.05 | ±0.12 |
| 1.2 | 30% | ±0.05 | ±0.15 | |
| 1.2 | 1.2 | 30% | ±0.05 | ±0.15 |
| 1.5 | 33% | ±0.05 | ±0.15 | |
| 1.5 | 1.5 | 35% | ±0.06 | ±0.15 |
| 2.0 | 38% | ±0.06 | ±0.15 | |
| 1.8 | 1.8 | 40% | ±0.06 | ±0.15 |
| 2.5 | 48% | ±0.06 | ±0.15 | |
| 2.0 | 2.0 | 42% | ±0.06 | ±0.15 |
| 2.2 | 45% | ±0.07 | ±0.17 | |
| 2.5 | 48% | ±0.07 | ±0.17 | |
| 3.0 | 52% | ±0.07 | ±0.17 | |
| 3.2 | 55% | ±0.07 | ±0.17 | |
| 3.5 | 58% | ±0.07 | ±0.17 | |
| 4.0 | 60% | ±0.07 | ±0.17 |