【Strong Suction】The product has a thick rubber suction cup with strong suction power, which can be easily fixed on the drilling surface by pressing the handle. 【Function】This product is a glass tile hole locator, used to assist in positioning the hole. The bearing slide design makes it easy to position drill bits of different sizes. 【Prevent Smoothness】With the positioning hole opener, there is no need to worry about the drill bit slipping because the glass and tiles are too smooth when opening the hole. 【Good Performance】Four bearings clamp the drill bit to determine the position; Two oversized positioning screws, easy to turn and lock, and precise drilling. 【Main Application】 The product is suitable for drilling and positioning glass, ceramic tiles, marble and ceramics.