Electroplated Diamond Core Drill Bit Sets 6pcs / Set Customized Diameters

electroplated diamond core drills kit 6pcs /set Application: Our Diamond Core Drill Bits are welded by the professional diamond electroplated. Drilling glass, ceramic, marble, granite, porcelain tile, limestone, quartz, bricks, masonry, cement, cement block, and concrete with fast speed, durability and smooth operation, various sizes and designs available upon customer requirements. Description: 1. Diameters: φ19/22/29/38/44/57mm, or as customer's requirement 2. Diamond grit: