MAKITA, 4 1/2 in Blade Dia., 7/8 in Arbor Size, Diamond Blade - 330ZD3|B-69593 - Grainger
Amazon.com: Makita 5 Pack - 4 Inch Cut Off Wheels For 4" Grinders - Aggressive Cutting For Metal & Stainless Steel - 4" x .045" x 5/8" : Industrial & Scientific