Description: Material: High quality diamond brazing process, sharp toothed edge, durable and long service life. Neat openings: smooth and no broken edges, no tremor phenomenon. Design of chip removal hole: All specifications have special hole for chip removal. Features: easy loading and unloading, saving time and effort. Scope of application: Suitable for all kinds of stone, ceramics, vitrified tiles, glass, etc., making clean and accurate holes on glass and tiles. Specification: Material: Diamond Color: Golden Cooling type (internal cooling/external cooling): external cooling Opening diameter 6mm Size: The total length 6.5cm/2.56inch, upper handle diameter 6cm/2.36inch Opening diameter 10mm Size: The total length 6.5cm/2.56inch, upper handle diameter 8cm/3.15inch Package Includes: 1 Piece Diamond Drill Bit (6 Pack) Note: Notes: 1. Since this hole opener does not have a center positioning rotation, be careful in operation and please pay attention to safety. 2. The speed should not be too fast. 3. It is necessary to continuously add water for cooling, and it is strictly forbidden to run dry,high temperature friction occurs, and serious wear and tear will affect the use effect.