Specifications: Made of engineering grade plastic, durable quality, not easy to get cracked as those fragile ones. Adjustable plates opening length is 4-80mm, large enough to put in all sizes hole saws. More accurate drilling, easy to store and can be used for many times. Suction base has good strength to hold the centering jig tight and well on smooth surface. Guide hole saw or drill bit to drill clear holes on tile, glass, marble, fish tank, granite, ceramic, etc. Item Name: Adjustable Hole Locator Material: ABS + Metal Clamping Range: 4-83mm/0.2-3.1inch Features: Adjustable, Hole Saw Guide, Suction Base Size: 26.5cm x 13.5cm/10.35" x 5.31" (Approx.) Notes: Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Adjustable Hole Locator