characteristic: This set of diamond hole saw is made of durable high-quality alloy materials and diamond grinding, which can meet your work needs. Improve your work efficiency makes you more portable at work. which are not easy to lose and easy to store. Accurate drilling can be achieved without additional drilling tools. When water is needed for long-term work, it can prevent the bit from overheating, protect the bit and prolong its service life. Suitable for all kinds of stone tools and , including marble, tiles, etc., and can be used for decorative drilling in industrial buildings and houses. The sharp drill can effectively improve work efficiency. The products are suitable for hand electric drills and bench drills, and the drill bit diameter is 6/8/10/12/14/16/18/20/22/25/30/35 mm. Suitable for most angle grinders. describe Name: brazing hole opener set Material: Metal colour: gold Package Contents: 1 x Brazing hole opener set 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.