Abrasive cut-off wheels aluminum oxide -metal -7/8 inch arbor -4-1/2 inch diameter -13,580 maximum rpm For traditional cut-off applications. Thin design for cleaning, slotting and cutting metal, metal studs, angle iron, tubing, autobody panels and sheet metal. Supplied with full fiberglass reinforcing. Use with right angle grinders. Type 1 center.045 bla de thickness.