Cov lus qhia dav dav ntawm cov rivets dig muag:
1. Feem ntau, muaj rau series ntawm 2.4 / 3.2 / 4 / 4.8 / 5 / 6.4.
2. Qhov ntev yog 11 series 6-8 — 8.5 — 9.5 — 11 — 12.5 — 13 — 14.5 — 15.5 — 16 — 18 — 20.
3. Qhov ntev ntawm kev ua lag luam yog 22-25-30-40-50-60 (hli).
4Stainless hlau 3.2 txoj kab uas hla thev naus laus zis tuaj yeem ua tiav 16 hli ntev.
Lub sijhawm tshaj tawm: Lub Xya Hli-08-2021