These grinding discs are suitable for metal grinding in a variety of trades Proflex is a top quality, long life grinding disc range suitable for a full range of grinding applications. Professional quality for the professional user. Features: Excellent service life Consistent stock removal High end quality for the highest demands Manufactured using premium raw materials Manufactured to European quality standards EN12413 Discs suitable for metal grinding in many applications and industries Specification: Bore: 22mm Grade: A24RBF Thickness: 6.0mm Max. speed: 13,300RPM Diameter: 115mm (4½ \")