Description: 100% brand new and high quality Features: Made with carbide, great hardness provides sharp edges, high work effiency. Drilling length can be adjusted for various screws, simply loosening and tightening the setscrews. Design of triangular shank makes the clamping more tight and does not slip. Dual spiral groove is smooth and flat, which can discharge the sawdusts more rapid. Strengthen enough, provides smooth and accurate drilling in tile, glass, brick wall, wood and so on. Specifications: Material: Carbide Diameter: 6mm, 8mm, 10mm, 12mm(optional) 6mm Size: Approx. 6x151 mm/0.23x5.94 inch 8mm Size: Approx. 8x182 mm/0.31x7.16 inch 10mm Size: Approx. 10x204 mm/0.39x8.03 inch 12mm Size: Approx. 12x204 mm/0.47x8.03 inch Note: Please allow 1-2cm errors due to manual measurement,pls make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package Includes: 1 Piece Drill Bit