Peb muab ntau hom kev teeb tsa ntsia hlau, suav nrog lub khob taw tes, lub khob hliav qab, taw tes tiaj tus, thiab tus dev taw tes, txhua tus haum rau cov ntawv thov tshwj xeeb. Ntxiv mus, peb cov screws muaj nyob rau hauv ntau yam ntaub ntawv xws li stainless hlau, tooj dag, thiab hlau alloy, kom ntseeg tau compatibility nrog txawv ib puag ncig tej yam kev mob thiab corrosion kuj.