big diameter abrasive discs for metal,stainless steel,stone cutting medium hard fast working speed durable working lif CHARACTERISTICS: made of normal grade corundum(Aluminium oxide),medium hard bond, flat type, black color, 1net in middle of the discAPPLICATIONS: general purpose abrasive disc for all metal cutting applications, like normal steel pipe, steel bar, steel plate and grooving, etc. ...