The 9001SK push button line has a large variety of operators and accessories for heavy industry applications. These operators are used in the petrochemical, metallurgy, mining, oil and gas, wastewater treatment and automotive manufacturing industries and more. Type SK operators have a plastic operator that mounts in a 1.18 inch round hole. This 2 postion non-illuminated selector switch has a plastic ring nut. The selector switch is maintained in both positions. This selctor switch has no knob. The desired knob needs to be ordered separately. Contact blocks with the desired contact arrangements must be added to this operator. When properly installed with a lens cap this opertor is UL listed for Types 1, 2, 3, 3R, 4, 4X, 6, 12 and 13 environments. This operator is UL Listed and CSA certified. "This product is certified by CSA LR 25490 class 3211 03, UL listed file E42259 CCN NKCR and CE." "It is installed into a 30mm panel cutout." "The modular range of 30mm plastic control and signaling provides robust and reliable solutions for a wide range of heavy industry applications."