Lub davhlau ya nyob twg yog qhov xaus ntawm cov hlau. Hauv kev tsim hluav taws xob, lub davhlau ya nyob twg yog hais txog qhov thaiv cov davhlau ya nyob twg, tseem hu ua cov xov hlau thaiv. Cov hom tau muab faib ua ib lub qhov, ob lub qhov, lub qhov (socket), nuv, thiab lwm yam Los ntawm cov khoom siv, tooj liab nyiaj plating, tooj liab zinc plating, tooj liab, txhuas, hlau, thiab lwm yam. Lawv lub luag haujlwm tseem ceeb yog xa cov hluav taws xob lossis hluav taws xob.
