Features 1、Good Heat Dissipation: These drill bits have wax inside to absorb and dissipate heat for faster and cooler drilling performance 2、Good Performance: The drill bits are designed with M14 female thread and slip proof handle, feature large torsion and high bearing capacity, suitable for marble, glass, tiles, etc. 3、Long Service Life: The drill bits are uniformly coated with thickened emery, which improve wear resistance and service life, has stable performance 4、Stable and Durable Material: The hole saw adopts fine natural diamond powder, the cutting blade is made of excellent diamond, which has more effective performance than traditional carbide or bimetal hole saws 5、Equipped with Aluminum Box: The drill bit set equipped with high end aluminum box for storage, which provides good rust and corrosion resistant Specification Item Type: Diamond Drill Bits Material: Diamond Color: Black Aperture: Approx.6mm/0.2in, 6mm/0.2in, 8mm/0.3in, 8mm/0.3in, 10mm/0.4in, 12mm/0.5in, 14mm/0.6in Head Height: Approx.15mm/0.6in Working Length: Approx.35mm/1.4in Overall Length: Approx.60mm/2.4in Female Thread: M14 Package List 7 x Diamond Drill Bit 1 x Saw Blade 1 x Aluminum Box 1 x Manual