Professional tool for commercial or occasional use Suitable for cutting most general building materials including stone / brick / wood / concrete / masonry / asphalt / marble / granite etc... Not suitable for metallic materials Allow blade to cool every 30 60 seconds Suitable for dry or wet use. Diamond cutting disc suitable for all makes of grinders Comes with a 20mm bore reduction ring. DISC DIMENSIONS ARE AS FOLLOWS 115mm x 1.9mm x 22.2mm 4-1/2" x 3/32" x 7/8"