More Stable- Different from the traditional suction cup drill guide, our tile hole locator adopts double suction cup, which has good strength and prevents side bends or falling off to keep the jig firmly. The adjustable tile drill guide has strong clamping force, so the drill won't move and keep it running smoothly. Multi-function hole locatorThe opening length of the adjustable plates is from 4-83mm, large enough to fit hole saws of all sizes, meeting your different drilling needs and changing the adapter quickly. High Quality- The drill guide in Glass is made of engineering grade plastic, which is durable, safe, not fragile, reusable, high hardness and long service life, saving you more money. Easy to use - The tile drill locator can be firmly attached to the landmarks on the smooth surface. The wheel axle is used to accompany the rotation of the drill bit without jamming, more precise drilling, convenient for daily drilling work, and greatly improve work efficiency. (Note: Only applies to smooth surfaces) Wide Application- The drill locator is small in size, easy to carry and store, perfect for drilling holes in ceramics, glass or marble tiles, aquariums, granite and ceramic surfaces.