Feature:1. Excellent Alloy Material: This twist drill bit is made of excellent alloy material, which has high hardness and durability.2. Hex Design: This twist drill bit features a hex design that allows for a larger contact area between the bit and the drill interface, providing better stability and reducing the risk of slippage and drill breakage.3. 4 Flute Drilling: This twist drill adopts four flute drilling, which is fast and accurate, and improves the working efficiency.4. Multiple Sizes: This twist drill bit set has multiple sizes, from 3mm to 12mm, which can meet your different usage needs.5. Convenient To Carry: This twist drill bit set comes with a storage case to keep the drill bits organized for easy storage and carrying.Specification:Item Type: Masonry Drill Bit SetMaterial: Alloy.Package List:7 x Masonry Drill Bit1 x Storage Box