kwb Drill Bits & Parts Tile drill bit 610604 - KWB 500306, The kwb HM Fliesenbohrer 6-Kant 6 mm is a tile drill bit featuring a robust hex shank design for secure fit and efficient operation. It is ideal for precise drilling in hard materials like tiles, with a 6 mm diameter perfectly suited for standard applications. This single-piece product, known as kwb 500306, ensures durability and reliability for both professional and DIY use. kwb 500306 HM Tile Drill Bit 6mm Hex shank for tiles and stone