SHDIATOOL Brazed Diamond Core Drills with M14 Thread for Extension Holes 2pcs

ITEM:  Diamond Brazed Core Drills For Extension Holes Quantity: 2pcs Specificiation: Diameter: 9.7mm, Total length: 48mm, Workable length: 20mm                         Diamond height: 4mm, Grit: #30/40,  M14 Thread Application: Dry/Wet drilling for Granite Marble Concrete Ceramics and other materials The drill is used to load the extension hole of the rear bolt stone to make the interior of the rear bolt hole larger. Feature:  1. High quality diamond particles provide fast and smooth drilling; 2. Vacuum brazing technology provides efficient working performance; 3. The design of chip removal groove makes it easier to discharge stone powder during drilling, improves the service life; 4. Less debris generated during use, reducing material loss;