Specification:Item Type: Hole Saw KitMaterial: Color: GreenHole Diameter: Approx.20mm / 0.8in25mm / 1in40mm / 1.6in45mm / 1.8in50mm / 2in68mm / 2.7inHead Height: Approx. 15mm / 0.6inWorking Length: Approx. 40mm / 1.6inOverall Length: Approx. 60mm / 2.4inFemale Thread: Scope of Application: Marble, glass, ceramic tile, granite and other stone openingsHow to Use:1. Firmly and correctly fixed on the angle grinder, turn on the angle grinder, let the drill bit rotate in the air, and check for balance problems.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 drill bit to the upright position, continue drilling and shake the machine slightly.Package List:6 x Bits1 x Aluminum Box1 x User ManualNote:1. Do not use these drills with a hammer2. Only mount these bits on corded drills, not cordless drills (not 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. Wear all applicable gear when using these bits