6-12mm Carbide Drill Bit Shank Triangular Twist Drill Bit Brick Drill Bits for Household Concrete Overlord Hand DrillOOTDTY Features: Made of carbide, strong hardness ensures sharp edges, high working efficiency. The drilling length can be adjusted for different screws by simply loosening and tightening the set screws. The triangular shank design makes the mount stronger and non-slipping. The double spiral groove is smooth and flat, which can discharge sawmills faster. Reinforcement enough, ensures smooth and accurate drilling in tile, glass, brick wall, wood and so on. Specification: Material: CarbideDiameter: 6mm, 8mm, 10mm, 12mm (optional)6mm size: Approx. 6x151mm/0.23x5.94 inch8mm Size: Approx. 8x182mm/0.31x7.16 inch10mm Size: Approx. 10x204mm/0.39x8.03 inch12mm Size: Approx. 12x204mm/0.47x8.03 inchPackage Includes: 1 Piece Drill Bit Note: Please allow 1-2cm errors due to manual measurement, pls make sure you do not mind before ordering. Due to the difference between different monitors, the picture may not reflect the actual color of the item.