Package Contents: 4 black 4-way valve keys covering four sizes: 1/4 inch (6.4 mm), 9/32 inch (7.1 mm), 5/16 inch (7.9 mm), and 11/32 inch (8.7 mm). Premium Material: Made from 40Cr steel sturdy, durable, and rust-resistant for long-term use. Versatile Tool: Features 4 square sockets for flow control suitable for various applications including utilities, water supply, gas systems, trains, faucets, and elevators. Easy to Use: A practical tool for operating faucets, shut-off valves, and various other valves, or for replacing worn-out faucet handles. Wide Application: Suitable for use with faucets, valves, radiators, and similar equipment. Weight: 1.21 lbs.