Accurate Starting Position for Tile Drilling The BIHUI® 7-Hole Universal Drill Guide helps position compatible diamond drill bits and hole saws before drilling tile, porcelain, stone, and other hard materials. A high-quality suction pad secures the guide to suitable smooth surfaces to reduce bit wandering during startup. Seven Integrated Drill Guide Sizes Seven openings accommodate 4, 5, 6, 8, 10, 12, and 14 mm drill sizes, covering an approximate imperial range of 5/32" to 9/16". The integrated openings allow the appropriate guide size to be selected without changing the complete tool. ABS Body with Steel Reinforcement The guide is constructed from ABS material and incorporates a steel plate to support precise drilling. A comfortable nylon handle provides controlled positioning, while the portable design can be used for compatible wet or dry drilling applications.