MATERIAL: This holesaw guide is made of durable engineering grade ABS plastics and not easy to break,a tile hole locator can be used for years. ADJUSTABLE PLATE SIZE: The plate has an adjustable opening length of 4 to 83 mm,large enough to fit in blad es with all sizes of hole saws,4 removable bearings can be repositioned at the 9 bearing holes depend on your needs. DOUBLE STABILITY: Two vacuum suction base has better resistance than one suction base and keeps the centering clamp on a smooth surface. EASY TO USE AND STORE: This tile hole saw guide offers more precise drilling, easy to store and can be used for multiple times.Guide hole saw or drill bit to drill clear holes on tile, glass, marble, countertop, granite, etc WIDELY APPLICATIONS: Drill hole saw guide with water cooling holes widely use for drill bit to drill clear holes on tiles, glass, fish tanks, marble, granite, ceramics.