Mexco professional wet core drills have been developed to offer maximum effectiveness in the hardest of natural and man made materials. These products have laser welded segments to prevent segment loss, and a rooftop segment for easier starting in harder materials. Universal Reinforced Concrete Segment. Cuts Granite, Flint, River Gravel and Limestone Aggregate Concrete. Applications: Granite, Reinforced Concrete & Brick. Only choose the best tools for the job – choose Mexco Diamond Blades – Demand the BEST!