Premium Diamond Grit & Vacuum Brazed Technology: Engineered with industrial-grade diamond particles and vacuum brazing technology, our drill bits maximum durability and heat resistance Dry & Wet Drilling Flexibility: Built-in cooling lubricant allows dry drilling, while water can be added for extended bit life. Great for effortless cutting through ceramic, porcelain, masonry, glass, marble, , and more Hex Shank for Secure Grip: 1/4inch quick-change hex shank fits securely in electric drills, cordless drills, or benchtop drills. No slipping & wobbling-just precise drilling at speeds of 2000 RPM or higher for optimal performance and extended tool life Multi-Size Kit for Versatile Use: Includes 10 pieces - 1/4inch, 5/16inch, 3/8inch, 1/2inch (6mm, 8mm, 10mm, 12mm) to handle projects from small DIY crafts to large-scale renovations. Clear size markings easy identification Best Practices for Extending Drill Lifespan: Begin by opening the C pressure slot at a 45-degree angle, ition to a vertical position gradually. For easier handling, guide the bit with a wet sponge<br><br>Color: As Shown Material: Metal<br><br>Package Contents: 1 * Diamond Drill Bits Set<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.