2.Universal fit fun gbogbo awọn dimu bit boṣewa & awọn irinṣẹ agbara.
3.Reinforced sample fun gun aye ju boṣewa bit.ribbed sample withstand soke si 50% iyipo ṣaaju ki o to iye.
4.Chrome-vanadium-molybdenum irin-irin irin tabi ile-iṣẹ S2 ọpa irin ti wa ni afẹfẹ lati ṣe afikun lile fun ilọsiwaju ti o pọju.
5.Heat trated lati koju fifọ ati wọ .Ti a ṣe pataki lati dinku idinku.
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