This is a Total brand cutting disc, model TAC, designed for cutting metal and stainless steel.Size Specifications: The disc measures 230mm in diameter (9 inches), with a thickness of 1.6mm and a center bore of 22.2mm.Performance Rating: It is rated for a maximum speed of 6,650 RPM or 80m/s.Safety Standards: The disc is labeled for compliance with EN12413 safety standards and is suitable for use on large angle grinders.