Specification:Item Type: Hole Saw KitMaterial: Color: Gold6pcs Hole Drill Diameter: Approx.20mm/0.8in, 20mm/0.8in, 27mm/1.1in, 35mm/1.4in, 55mm/2.2in, 68mm/2.7inHole Drill Total Length: Approx.75mm/3inHole Drill Sand Width: Approx.15mm/0.6inHole Drill Working Length: Approx.55mm/2.2inFemale Thread: End Mill Diameter: Approx.20mm/0.8in, usable length: Approx.50mm/2in, overall length: Approx.70mm/2.8inAdapter: male thread, 3/8in hex shank, overall length: Approx.60mm/2.4in, shank length: Approx.28mm/1.1inScope of Application: Marble, glass, ceramic tile, granite and other stonesHow to Use:1. Fix the drill bit firmly and correctly on the angle grinder, turn on the angle grinder, let the drill bit rotate in the air, and check if there is any balance problem.2. Place the drill bit at an angle of 15‑45 degrees and drill down gently at an oblique angle.3. When drilling about a semicircle, gradually raise the bit to the upright position, continue drilling and shake the machine slightly.Package List:2 x 20mm Hole Saw1 x 27mm Hole Saw1 x 35mm Hole Saw1 x 55mm Hole Saw1 x 68mm Hole Saw1 x 20mm End Mill1 x Adapter1 x Aluminum Box1 x ManualNote:1. Do not use these drills with hammer mode2. Install these bits on a corded drill, not a cordless drill (doesn't have enough power)3. Only for tile drilling, not recommended for materials behind tiles4. For horizontal drilling, just apply light pressure5. For vertical drilling, the weight of the machine will provide enough pressure6. Finger drills are used to enlarge, reshape or round the bevel of existing holes7. Please wear all applicable gear when using these bits