Strip Heater Heater Voltage 240V AC Terminals Offset Overall Length 21 in Mounting Dimension 20 in 500 W Watts Watt Density 10W/sq in Sheath Material Stainless Steel Material 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