It is a super easy tool to replace the diamond hollow drill. The hollow drill is made of high quality, which is durable and has a long service life. It is which is easier to use than marble. The surface of the drill bit is and does not hurt hands. Use these crown tiles to upgrade your crown in a simple and fashionable way. They are made of durable high-quality that have been tested for strength and durability. Easy to install and disassemble, which can time and energy. There is a small hole in the middle, so you can easily hang it or other without taking up too much space. The drill bit is made of high-quality, which is durable and not easy to break. It can be used for a long time. Application: used for drilling holes in marble, ceramic tiles, granite, , walls and other materials. Material: Metal colour: black+Silver Package Contents: 5 x Brazing hole opener 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.