Lub zog loj Groove dav 40mm cov khoom siv thauj mus los 4 meter tus qauv ntev steel cov menyuam taug qab nrog tuav ntug log
Peb yog cov chaw tsim khoom ntawm steel roller khiav.Peb cov khoom muag ncaj qha los ntawm cov chaw tsim khoom.Nrog tus nqi qis thiab kev xa khoom loj, peb yog qhov kev xaiv zoo tshaj plaws rau cov neeg muag khoom.