Strip Heater, Heater Voltage 120V, Terminals Parallel, Overall Length 17 7/8 in, Mounting Dimension 16 7/8 in, 500 W Watts, Watt Density 11 W/sq in, Sheath Material 304 Stainless Steel, Material Seamless Stainless Steel, Mounting Type Surface Mount, Slotted Hole Length 1/2 in, Slotted Hole Width 5/16 in, 1 Phase, Max. Sheath Temp. 1,200 Degrees F, Screw Size 10-32, Standards CSA, cURus, NRTL, UL E65652 Under CCN KSOT2/8 UL 499 and Canadian Standard C22.2 No 72, UL Recognized