Made of dielectric Zenex thermoplastic to withstand chemicals, Master Lock Rotating Gate Valve Lockouts have an outward/inward rotation that surrounds the valve operating handle to protect against accidental valve opening. Each size rotates into itself and nests into the next larger size to save space, and center knockout can be removed for rising stem gate valves. Multiple workers can apply their personal safety locks. Lockouts performs effectively in extreme conditions (-50F to 350F) and include hi-visibility permanent safety labels in English, French, and Spanish.