Diamond hole saw Features: 1) Diameter:4 -120mm available 2) Diamond grit: #40. 3) Smooth cutting surface and high cutting speed 4) Suitable for cutting, drilling various hard Non-ferrous material, such as marble and granite glass, ceramic, hard concrete and brick 5) Special design available upon request. Diamond hole saw for professional market Please contact us directly, if you are interested in our products. I will reply you on time.