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: 6.3 inches (160 mm); Thickness: 0.03 inches (0.7 mm); Inner Diameter: 1.0 inches (25.4 mm); Quantity: 25 pieces