four blade drill bit ceramic tile hexagonal handle brick wall cement ceramic perforated drill Feature Use alloy as. The bit oxynitriding process strengthens the hardness of the bit. 4 different sizes: 6/8/10/12mm The cutting resistance is small, the drilling is stable, the speed is fast, and is broken. The opening is, smooth, without broken edges, without tremor, and. Fully polished and anti-rust, clean and without burrs. The drill bit is more wear-resistant and more. Fully automatic polishing: polishing CNC is fully automatic, and each is unified. Small size and light weight, very suitable for wood, plastic, walnut, amber, beads, beeswax, olive fruit, small model kits and many other DIY that require drilling. Quality assurance. We are full of confidence in our products and are by trustworthy customer service. If you have any questions or questions about our products, contact us. Specification Material: Steel Color:, black Size: 6/8/10/12mm The package includes 1pc: 1X drill bit 4pcs: 4X drill bit (6/8/10/12mm) 5pcs: 4X drill bit (6/6/8/10/12mm) Use alloy as. The bit oxynitriding process strengthens the hardness of the bit. 4 different sizes: 6/8/10/12mm The cutting resistance is small, the drilling is stable, the speed is fast, and is broken. The opening is, smooth, without broken edges, without tremor, and. Fully polished and anti-rust, clean and without burrs. The drill bit is more wear-resistant and more. Fully automatic polishing: polishing CNC is fully automatic, and each is unified. Small size and light weight, very suitable for wood, plastic, walnut, amber, beads, beeswax, olive fruit, small model kits and many other DIY that require drilling. Quality assurance. We are full of confidence in our products and are by trustworthy customer service. If you have any questions or questions about our products, contact us.