Features: Made of industrial-grade materials and high speed steel construction with titanium coating for enhanced durability. The kit has all useful dimensions for screw drilling from 2mm, 2.3mm, 2.8mm, 3mm and 3.5mm and has a wrench for quick and easy resizing. The drill bit is robust and penetrable through wood and laminate. It is a good helper for DIY amateur and professional carpenter. The bit set has all the most common bits needed for most home projects and is suitable for anyone doing home renovations. The length of drills can be adjusted with the hex key, which can suitable for different depth of the wood. Specifications: Material: High Speed Steel Package Size: 10 * 8 * 1cm / 3.9 * 3.1 * 0.4in Package Weight: 80g / 2.8oz Package List: 5 * Countersink Drills