Accurate Hole Positioning for Tile Drilling The BIHUI® Universal Drill Guide helps position diamond drill bits accurately when drilling tile, stone, porcelain, and other hard surfaces. Its high-quality suction pad secures the guide to smooth surfaces, reducing bit wandering and improving drilling precision. Multiple Drill Bit Guide Sizes The guide accommodates drill bit sizes from 5/32" to 9/16" (4 mm to 14 mm), making it suitable for a wide range of hole saws and diamond drill bits. Multiple integrated guide openings allow quick selection of the correct drilling size without changing accessories. Durable Construction for Repeated Use Constructed from durable ABS material, the drill guide features an integrated steel plate for added drilling stability and a comfortable nylon handle for secure positioning during use.