That's what it should be, a standard extension. It includes screws and is made of heavy duty galvanized steel. As always, watch out for sharp edges (like any other box).
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Wireless Electronic Ballast Interface Certified
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π Robertson 2P20132 Quik-Pak: 10 Fluorescent eBallasts for 2 F40T12 Linear Lamps, Preheat Rapid Start, 120Vac, 50-60Hz, Normal Ballast Factor, NPF, Model RSW234T12120 /A (Crosses to RSW240T12120 /B)
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