The X-LOCK Quick Change System provides up to 5X faster blade changes. The X-LOCK 4-1/2 Segmented Diamond Blade (E-07191) is designed for masonry cutting, including concrete, block, brick, pavers, and roof tiles. It is made with high-quality diamonds, carefully tensioned for less vibration, and features a segmented rim for faster, aggressive cutting. The blade can be used for dry or wet cutting. X-LOCK quick change system also allows for easy tool-free blade changes by simply pulling the release lever on Makita X-LOCK Angle Grinders (sold separately).