RIDGID Turbo Segment Diamond Cup Wheels are engineered with top-grade industrial diamond for maximum cutting performance and superior grinding life. These cup wheels can be used for a wide range of projects from shaping and polishing of concrete surfaces and floors, to fast aggressive concrete grinding or leveling and coating removal. Heavy-duty steel core offers lasting durability. 4.5 in. cup wheel will fit a variety of small angle grinders with a 5/8-11 threaded arbor. Suitable for both dry or wet cutting conditions.