Durable plastic resists chemicals and temperatures to 240Stainless steel hinge for added strength and securityUnique knockout feature accommodates OS&Y or rising stem gate valvesAccepts locks with up to 3/8 in. shacklesThe Gate Valve Lockouts are made with a unique patent pending rotating design that allows for easier installation in confined space applications. Each size rotates into itself and nests within the next larger size for space saving and easy storage. Lockouts also come complete with high-visibility, re-usable, write-on safety labels (English, French & Spanish). The tough, lightweight, di-electric thermoplastic bodies are made to withstand chemicals and perform effectively in extreme conditions.Unique patent pending rotating design allows for easier installation in confined space applicationsEach size rotates into itself and nests within the next larger size to save space in storageUp to four workers can apply their personal safety locksComplete with high-visibility permanent safety labels (English, French & Spanish) that can be written on to identify the responsible person, then erased for the next jobTough, lightweight, dielectric thermoplastic bodies withstand chemicals and perform effectively in extreme conditions, temperature range: -50F (-46C) to +350F (177C)