"It is compatible with angle grinders. The Locking Nut clamps grinding discs with a 115-230 mm diameter manufactured before 08/90.
Locking nut for clamping all discs with 115 - 230 mm diameter, manufactured after 08/90.
• Clamps Grinding Discs With 115-230 mm Diameter • Locking Nut clamps grinding discs with a 115-230 mm diameter manufactured before 08/90 • Compatible with angle grinders"