Hexagonal Key Sets Secure Tools supplies Hexagonal key sets. They are collections of hex keys that come in a variety of sizes. These sets are designed to provide users with a range of hex keys to tackle different screw and bolt sizes. Hexagonal key sets typically include multiple hex keys in a compact and organized package. The keys are often made of hardened steel or other durable materials to withstand high torque and repeated use. Each hex key in the set has a hexagonal (six-sided) tip, which fits into the corresponding hexagonal socket of the fastener.