Abrasive Blocks Abrasive Blocks (Vitrified Only) Size: Thickness (1/2″ to 2″) x 6″ x 8″ Grains: Silicon Carbide – Green, Black Aluminum Oxide – White, Brown, Pink Grit Sizes: 60 to 600 Hardness Grades: D to T Call 1-800-992-2402 for pricing