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 3 postion illuminated selector switch has a plastic ring nut. The selector switch is maintained in all three positions. This selector switch has a 110/120 VAC 50/60 Hz transformer light module to provide the illumination. The light module has an incandescent lamp. This selctor switch has a green standard knob. 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. "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."