This 8-piece tool set includes four wrenches, two 4-way valve keys, and two gold-colored faucet keys. The faucet keys are made of 40Cr steel, ensuring durability and rust resistance. The 4-way valve keys are made of zinc-plated alloy with a square socket inner diameter of approximately 0.24 inches (6 mm), designed primarily for locking faucets and radiator valves. The cross-shaped faucet wrenches are compatible with multiple sizes: 1/4 inch (6.4 mm), 9/32 inch (7.1 mm), 5/16 inch (7.9 mm), and 11/32 inch (9.0 mm). This versatile key set is suitable for various types of valves (such as outdoor water valves and radiator valves), allowing for valve operation or the replacement of worn-out valve handles. Functioning as multi-purpose wrenches for turning screws or replacing old handles, these tools are suitable for applications involving electricity, water supply, gas, trains, cabinets, elevators, and various valve systems. Weight: 0.15 lbs.