Strip Heater, Heater Voltage 120V AC, Terminals Parallel, Overall Length 21 in, Mounting Dimension 20 in, 500 W Watts, Watt Density 8W/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 UL Recognized, Includes Mounting Tabs