Features: brand new and high quality Complete specifications, 20mm/25mm/32mm/35mm/40mm/45mm/50mm/63mm. High-quality alloy, durable and wear-resistant. Simple installation, add angle grinder gasket; screw the hole opener onto the gasket.; confirm tightening. Suitable for many occasions, ceramic tile, glass, granite, marble. Work efficiently and improve work efficiency. Specifications: Material: Alloy Type: 5PCS, 6PCS, 8PCS (Optional) Net weight: 1250g/ 2.76 lbs 1500g/ 3.31 lbs 1800g/ 3.97 lbs Package Includes: 5/ 6/8PCS Marble Hole Opener note: Please allow 1-2cm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Precautions 1.Should not be used for punching metal materials. 2. When drilling holes, be sure to adjust the drilling depth. 3. Please wipe off the dirt on the surface of the product after use, which can prolong the service life. 4. After the installation is completed, it needs to be idling to confirm that there is no shaking before the drilling operation can be performed.