黑刚玉砂(又名低铝刚玉砂，铁砂粉)是一种新型抛光材料。
Black Aluminium Oxide AbrasiveBlack Aluminium Oxide abrasive (lower Aluminium Oxide abrasive) is a new type abrasive material for polishing various metal works.
黑刚玉砂（又名低铝刚玉砂，铁砂粉）是一种新型抛光材料。
Black Aluminium Oxide Abrasive
Black Aluminium Oxide Abrasive(lower Aluminium Oxide Abrasive)is a new type abrasive material for polishing various metal works.
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