Kev kho tus kheej cov hlau hose pob qij txha tuaj yeem txuas cov kav hlau tsis sib txuas lossis cov khoom siv tsis sib txuas nrog cov hoses, txuag cov txheej txheem threading;
Cov hlau sib koom ua ke no yog kho tus kheej, siv los txuas cov hlau hose mus rau cov yeeb nkab uas tsis muaj steel los yog cov khoom siv tsis sib txuas;
Haum rau cov kav hlau: nyias steel hlau kav, dub thiab dawb hlau kav (dej, kav dej);
