These are heavy-duty wood screws, also known as lag screws or coach screws, perfect for serious wood-to-wood connections. They're from the German brand Dresselhaus and conform to the DIN 571 standard, which means they're high-quality. They have a classic hex head (you need a wrench or socket to drive them) and a coarse wood thread that bites deep for incredible holding power. They're made from steel and are galvanized (zinc-coated) for good corrosion resistance, making them suitable for outdoor projects like deck framing, pergolas, timber framing, or building sheds. You can choose from a wide range of sizes, from smaller 6mm diameter x 40mm long screws all the way up to massive 12mm x 300mm giants. They're sold in sensible quantities like 10, 25, 50, or 100 pieces. The right fastener for when you need serious strength.