【Size】Totally 5pcs/set: 4pcs 6mm diamond drill bits+1pc 6mm Carbide Drill; Total length 65mm; Diamond height 10mm; Diamond Grit #50/60; Triangle Shank; Handle diameter 10mm 【Application】Dry or Wet drilling Ceramic Porcelain Tile Ceramic Granite Marble Artificial Stone Quartz, etc. Wet using will prolong the working life 【Cooling Wax & Vacuum Brazed Technology】The inside of drill bits are filled with cooling wax, help heat dissipation and chip evacuation. Dry drilling without water, very convenient. Vacuum brazed technology and high-quality diamond grains provides fast and smooth drilling, longer working life 【Cross Helix Carbide Drill】Cross Helix Carbide Drill sloves the problem of diamond bit drifting and walking. Provide more precise positioning and easier drilling (Attention: This is not a core bit for drilling). 【Recommended Machine】Corded Drill, Cordless Drill, Benchtop Drill. Recommended speed: 2000-5000RPM; Faster the RPM, longer the drill bit's working life. When use Angle Grinder, please install angle grinder drill chuck