【Strong Suction】The product has a thick rubber suction cup with strong suction, which can be easily fixed on the punching surface by pressing the handle. 【Function】This product is a glass tile hole finder, which is used to position the hole. The rolling sliding design makes it easier to position drill bits of different sizes. 【Prevent Slippery】With the positioning hole opener, you don't have to worry about the drill slipping, because it is also smooth on glass and tiles when opening the hole. 【Good Performance】Four bearings clamp the drill bit to determine the position; two oversized positioning screws, easy to rotate and lock and precise drilling. 【Main application】 The product is suitable for drilling and positioning glass, ceramic tiles, marble and ceramics.