Blue Spot 19692 Aluminium Oxide Flap Disc 115mm (4.5″) 60 Grit Features and Benefits: Specially designed to be used with angle grinders for grinding flat surfaces. The conical shape provides an excellent angle for contour and edge grinding. Best used at a wider angle of 15 to 25 degrees. Features a depressed centre and are primarily used on alloy steel and low alloy steel. Type 29 flap disc. Diameter: 115mm (4 1/2″) / Bore: 22.2mm Maximum safe speed: 13280 RPM (80m/s) Grit: 60