This comprehensive 246-piece drill bit set from Terratek is designed to cover all your drilling and screwdriving needs. It includes a wide variety of bit types, such as HSS twist drill bits (including titanium and black oxide finishes), wood drill bits, masonry drill bits, and flat wood drill bits, suitable for various materials like wood, brick, and metal. The set also contains a substantial collection of screwdriver bits, including Slotted, Phillips, Pozidriv, Torx, Hex (inch and metric), and Square types, in both 25mm and 50mm lengths. Additionally, the set comes with useful extras like a countersink, cupped nail punch, spade bit extension, arbor adaptor for hole saws, magnetic bit holder, hex keys, and hole saws. All components are neatly organized in a sturdy, multi-compartment storage case for easy access and transport. This set is ideal for a wide range of DIY jobs and professional use. Terratek offers a 2-year guarantee on this product.