Grinding tools and cut-off tools rotate abrasive wheels or other attachments to remove material and prepare surfaces for coating. Angle grinders hold grinding or cut-off wheels at a right angle to the tool body and are more compact, more versatile, and less aggressive than vertical grinders. Straight wheel grinders use thick wheels or stones to perform like handheld bench grinders. Die grinders grind, debur, and polish using burs, mounted points, and other attachments to perform more detailed work than larger grinders. Cut-off tools are dedicated cutting tools that make cleaner cuts than angle grinders. Tool post grinders mount on lathes to provide an alternative to a cylindrical grinding machine. Concrete and masonry grinders are used for planing, surface prep, and tuckpointing work on concrete, mortar, brick, and stone.