Usage Tips:About this item: [Diamond Drill Bits]These drill bit kits are made of upgraded carbon steel with smooth nickel plating surface to resist corrosion, sharp and durable without edge collapse. [Premium Quality]Coated with high quality diamond to improve drill efficiency and creates a sharp, high precision and smooth cut. [Hole Saw Set 10 Sizes]6-50mm,to meet various drill needs. [Versatile Uses]Diamond hole saw drill bit set kit are used to drill Glass, Porcelain, Ceramic, Marble, Granite Stone, Bottles, SUBEIREYFR, Pots. [Tips]Please keep adding water when drilling to extend the life.Besides the water lubrication will improve the drilling experience. Simply mounted on the ordinary hand drill can be used, need to add coolant when drilling, drilling force should be playful, especially when at the beginning of the drill and to drill through. Product name: Diamond hole saw 10 Sizes : 6-50mm Apply to ordinary glass tile openings, rounded beads, etc., mainly used for glass openings. Color: Silver Material: metal Package Contents: 10PCS x Diamond Drill Bits 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.