Xov Rolling tshuab yog tsim rau dov txoj kev ncaj, ntsia hlau thiab nplhaib hom, thiab lwm yam, nrog ib txoj kab uas hla ntawm Ø4-Ø36 nyob rau hauv txias xeev. Nruab nrog cov ntsia hlau pwm, nws kuj tseem muaj peev xwm ntawm kev tsim cov xov hlau zais (xov muab zais hauv qhov chaw ua haujlwm), tag nrho cov ntsia hlau. Tsim los ntawm vuam steel phaj, ...
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