Feature: 1. Diamond hole saws in 10 sizes: 6mm, 8mm, 10mm, 12mm, 20mm, 25mm, 30mm, 35mm, 40mm, 50mm are made of high‑strength carbon steel, making these diamond drill bits durable. 2. Diamond hole saws coated with high‑quality diamonds can increase the drilling speed, and can cut smoothly in a few seconds without folding edges. 3. Adjustable hole saw drill guide fixture with suction cup, the maximum opening length of the board is 3‑1/4in, which is large enough to fit all sizes of hole saws. 4. 2 Modes (3 or 4 bearings fixing ) are optional for you, just flip the plate, guide hole saw or drill bit to drill clear holes on tile, marble, countertop, granite, etc. 5. Used for drilling ceramic tile bottle, block jar, fiberglass, ceramic tile, slate marble, granite pumice Specification: Item Type: Hole Saw SetSpecification: 10PC (6,8,10,12,20,25,30,35,40,50mm)Material: High quality silicon carbide Purpose: Can open holes on glass, ceramic tiles and marbleSize: Approx. 6mm / 0.2in8mm / 0.3in 10mm / 0.4in 12mm / 0.5in 20mm / 0.8in 25mm / 1in 30mm / 1.2in 35mm / 1.4in 40mm / 1.6in 50mm / 2inSize: Approx. 26cm / 10.2in13cm / 5.1in 14cm / 5.5in 18cm / 7.1in. Package List: 1 x Hole Saw Locator1 x 6mm Drill Bit1 x 8mm Drill Bit1 x 10mm Drill Bit1 x 12mm Drill Bit1 x 20mm Drill Bit1 x 25mm Drill Bit1 x 30mm Drill Bit1 x 35mm Drill Bit1 x 40mm Drill Bit1 x 50mm Drill Bit1 x Screwdriver1 x User Manual