Alloy hniav
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Parabolic spherical hniav
Cov hniav parabolic feem ntau yog siv los ua cov ntug thiab nruab nrab cov hniav ntawm ib tug down-qhov laum me ntsis, nrog rau nruab nrab corrosion thiab kuj nyuaj pob zeb!
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hemi-spherical kawg duab ntxig
Cov hniav conical feem ntau yog siv los ua cov hniav hauv nruab nrab ntawm ib qho kev xyaum me ntsis, haum rau cov pob zeb uas muaj qhov nruab nrab corrosion thiab hardness!Thaum lub pob zeb tseem mos, cov hniav tuaj yeem ua tau!
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conical hniav
Spherical cov hniav feem ntau yog siv los ua cov hniav rau hauv qhov chaw xyaum thiab tsim nyog rau cov pob zeb tawv thiab tawv heev.
