Item : SHDIATOOL 2PC Diamond Core Drill Bit Brazed Triangle Shank for Marble Granite Color: Blue Quantity: 2 piece only Specification: Diameter: 6mm,8mm,10mm,20mm, 25mm, 28mm, 30mm,32m, 35mm, 38mm, 40mm,45mm, 50mm, 65mm, 68mm; Diamond Height:10mm; Total Length: 65mm; Triangle Shank , handle diameter 10mm (That is very important for your machine) Application: For drilling granite & marble, masonry, concrete, tile/ceramic, glass, hard plastic..... Feature: 1. Three sided handle design, more stable clamping and drilling, less debris, less wear on materials and better finishing effect; 2. 10mm diamond at the top of the bit, which is densely arranged to make the drilling faster and longer service life; 3. Dry drilling without water; 6-10mm internal wax cooling, which extend the life of drill bits; 4. 20mm and above, with 4pcs slots on the top of the drill bit to improve the working efficiency of the hole drill; 5. Vacuum brazing technology has greatly improved product quality and service life, higher efficiency and lower cost; 6. Use a suction cup locator to position the hole accurately, or place the drill bit at a 45 degree angle to drill the hole until the drill bit begins to penetrate the material, and then lift the drill bit to vertical Position and continue; 7. When use, ensure that all forms of impact or hammering actions are closed;