Feem ntau yog rau vuam ntawm nyias-walled cov ntaub ntawv thiab precision qhov chaw.Nws muaj peev xwm paub qhov chaw vuam, taub qab vuam, plooj vuam, kaw vuam, thiab lwm yam., nrog rau siab nam piv, me me weld dav, me me tshav kub-cuam tshuam cheeb tsam thiab me me deformation.