Brand new Material: Nickel Plated Hole Saw Diameters: 3mm/0.12", 4mm/0.16", 5mm/0.20", 6mm/0.24", 8mm/0.31", 10mm/0.39", 12mm/0.47", 18mm/0.71", 32mm/1.26", 50mm/1.97" Good Performance and long life Excellent for making clean and accurate hole on glass and tile Works better with a electric drill (Excluding in the item) Use With any Drill or Power Tool These Diamond Bits are Capable of Drilling into Extremely Hard Materials Such as Stone and Glass. Use a Low Speed Setting and Proper Cooling, Such as Water, to Ensure Longer Lasting Life Superior Performance - Cut Holes in Marble, Slate, Glass, Tile, Stone, etc... Great for Home, Hobby, Craft, Construction, etc... Packaged included: 1 set Diamond Hole Saws(10pcs)