Transform your concrete and masonry work with this professional-grade set of diamond grinding cup wheels. The 4-inch (100mm) wheels feature a durable blue aluminum core and premium diamond segments arranged in an optimized pattern for aggressive material removal and smooth finishing. Compatible with standard angle grinders using a 7/8-inch arbor, these versatile wheels excel at shaping, cleaning, and finishing concrete, masonry, marble, granite, and brick surfaces. The twin-pack includes two complementary grinding patterns - one with a spiral arrangement for rapid stock removal and another with evenly-spaced segments for achieving a refined finish. The robust construction ensures consistent performance while tackling demanding surface preparation tasks. These wheels provide the reliable cutting action needed by contractors and DIY enthusiasts working on renovation, restoration, and construction projects. For best results, use with a variable speed angle grinder and appropriate safety equipment.