This is an item for business contractors. This product is especially effective for processing that requires precision using a precision cutting machine with an extra level of precision. Compatible Works: High hardness steel; Compatible material examples: High speed steel (SKH), Chrommolybdenum steel (SCM), Special steel (SMCM); Abrasive material: HA, Outer diameter: 10.0 inches (255 mm); Thickness: 0.05 inches (1.2 mm); Inner diameter: 1.2 inches (31.75 mm); Quantity: 20 pieces