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: Special Steel; Compatible Material Examples: Alloy Tool Steel (SKS), Bearing Steel (SUJ), Stainless Steel (SUS), Chrome Steel (SCR); Abrasive Material: WA; Outer Diameter: 12.0 inches (305 mm); Thickness: 0.05 inches (1.2 mm); Inner Diameter: 1.2 inches (31.75 mm); Quantity: 25 pieces