Feature1M14 Female Thread Design: The hole saw is designed in M14 female thread, the handle is slip proof, has large torsion and high bearing capacity2Thickened Emery Coating: The hole drill bit is coated by thickened emery uniformly, improves the wear resistant and service life, stable and durable3Excellent Diamond Made: The cutting blade is made of excellent quality diamond, features more efficient performance than conventional carbide or bimetal hole saws4Rust and Corrosion Proof: This drill bit kit is equipped with aluminum box for storage, rust and corrosion resistant5Application: This hole saw is used for marble, glass, ceramic tile, granite and other stones opening, no need to add water, can drill holes neatly and smoothly without broken edgesItem Type: Diamond Hole Saw KitMaterial: DiamondColor: 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: M14Diamond End Mill Diameter: Approx.20mm/0.8in, usable length: Approx.50mm/2in, overall length: Approx.70mm/2.8inAdapter: M14 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 stones Package List2 x 20mm Diamond Hole Saw1 x 27mm Diamond Hole Saw1 x 35mm Diamond Hole Saw1 x 55mm Diamond Hole Saw1 x 68mm Diamond Hole Saw1 x 20mm Diamond End Mill1 x Adapter1 x Aluminum Box1 x ManualNote1. 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 safety gear when using these diamond bits