Hlau-ntoo kuaj zaum

C-thav duab lossis H-thav duab siv 40x60x1.5mm cov khoom siv hlau, nrog cov pob qij txha txuas nrog los ntawm kev sib txuas ntawm qhov tseem ceeb xovxwm tsim nrog txias-kuav los tiag steel daim hlau. Nws yog ntawm zoo thauj khoom muaj peev xwm, muaj zog ywj pheej thiab yooj yim ntawm kev saib xyuas thaum siv los dai txee txee.