This 10.0mm 2-piece set is perfect for drilling larger holes in hard tile materials like porcelain and granite. Brand : Alpen Set Contents : 10.0mm Tile Drills (2 pieces) Application : Suitable for all tiles, especially porcelain and granite Machine Compatibility : Designed for cordless machines, 18V combi drills (rotary only) Optimum Performance : Use low-speed setting with firm pressure Durability : Natural cooling between holes extends drill life