A high-quality, hard-wearing white aluminium oxide bench grinding wheel with extra fine grit. Suitable for sharpening high-speed steel (HSS) tools and grinding non-ferrous metals including alloys. Dry-cutting use only. Manufactured with a 31.75mm bore and supplied with 5 reduction rings enabling each bench grinding wheel to fit most bench grinders with a bore size between 12.7 - 31.75mm. Compatible with 19mm and 20mm wheel face Draper Bench Grinders. Conforms to EN12413. Features and Benefits • 150mm x 20mm x 80G • Hard-wearing white aluminium oxide • 31.75mm bore and includes 5 reduction rings which enables compatibility with a most bench grinding tools (with a bore size between 12.7 - 31.75mm) • Suitable for sharpening HSS tools and grinding non-ferrous metals including alloys • Dry cutting only • Conforms to EN12413 Specifications Diameter: 150mm Thickness: 20mm Grit: 80G (Super Fine) Metres Per Second: 35m/s Max Speed: 4,450rpm Bore: 31.75mm Reduction Ring Sizes: 25.40mm / 22.23