Precious hlau dov zeb tshuab yog cov chav nyob rau hauv uas ib tug hlau ua txheej txheem yuav siv qhov chaw. Thaum lub sij hawm tus txheej txheem no ntau yam ntaub ntawv hlau tau dhau los ntawm ib tug khub ntawm yob, los yog cov khoom tuav cov khoom. Lo lus "dov" yog categorized los ntawm qhov kub thiab txias uas cov hlau tau dov. Goldsmith rolling mills ua haujlwm los ntawm kev siv ntau lub chais los tswj lub cev ntawm cov ntawv hlau. Hauv cov ntawv kub ua, lawv muab cov tuab tuab thiab sib xws rau cov nyiaj kub kub tooj liab daim hlau uas lawv siv. Cov tshuab Goldsmith muaj cov chais uas nyem thiab nias cov ntawv hlau thaum nws hla lawv.

Hasung muaj ntau hom hlau dov zeb tshuab, xws li kub hlau dov tshuab, hlau thiab ntawv dov tshuab, hluav taws xob dov zeb tshuab thiab hniav nyiaj hniav kub dov mills thiab lwm yam,. Hlau dov mills yog cov chav nyob uas cov xov hlau loj dua tau dhau los ntawm ob lub yob nrog cov qhov. Cov hlau loj tuaj yeem raug kho raws li qhov xav tau. Hlau kos tshuab nrog ntau yam tuag los ntawm kev txo cov hlau loj ib qho los ntawm ib zaug. Los ntawm qhov siab tshaj plaws 8mm hlau mus rau yam tsawg kawg nkaus 0.005mm los yog txawm me me.

Raws li ib qho ntawm cov kws tshaj lij hlau rolling zeb machinery tuam ntxhab , Hasung tau koom nrog hauv kev lag luam rolling mills, thiab tau cog lus los muab cov neeg siv khoom zoo tshaj plaws cov hniav nyiaj hniav kub dov mills, kub dov tshuab thiab lwm yam khoom thiab cov kev pab cuam.