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See more product details Made of high-strength carbon steel, the integrated steel structure makes these diamond drill bits more durable. Coated with high quality diamond,enhance the drilling speed and creates a sharp and smooth cut with no broken edges in seconds. Adjustable drilling guide with suction cup. The maximum opening length of the board is 3-1/4", which is large enough to fit hole saws of various sizes. The guide plate has 4 movable ball bearing, you can choose 2 modes (fixed 3 or 4 bearings), just flip the plate. Suitable for drilling holes in tiles, glass, marble, countertops, granite, etc.






