Specification： Comments:Phenomenal price to performance ratio! Suitable For:Steel, Stainless Steel, Iron, Fiberglass Size:3″ x .03″ x 3/8″ Diameter:3″ Thickness:.03″ (Same as 1/32″) Arbor Hole Size:3/8″ Grit:60 Grade:T (Hard) Bond:BF = Resinoid Reinforced Specification:A60TBF Max Operating Speed:25,000 RPM Material:Aluminium Oxide Type:1 – Flat Use:Die Grinder Feature: .