General description The 20 Pcs Diamond Drill Bits set includes 6mm dry diamond drill bits designed for drilling through various hard materials such as ceramic, tile, glass, marble, brick, and stone. These drill bits feature a 1/4 hex shank for better grip and efficiency during use. Technical specifications Quantity: 20 pieces Hole diameter: 6mm Shank type: 1/4 hex shank Length: 65mm Measurement allowed error: +/- 1-3 cm Usage To enhance the lifespan of the drill bits, it is recommended to start drilling at a 45-degree angle at high speed, then gradually adjust to a 90-degree angle. This technique helps in cooling the cutting edge and improving performance. Other information Color: Black Material: Diamond Package Contents: 20 * Diamond Drill Bits Note: Light reflection and different displays may cause the color of the item to differ slightly from the actual product.