Moffatt c-clamp task lamp, 95030, 18″ flex arm the c-clamp base mounting system comes complete with a 2″ opening, heavy duty c-clamp base. This c-clamp base mounting system allows for numerous mounting positions. features c-clamp base attaches to any surface up to 2″ thick arm length: 18″ double-wall shade keeps outer surfaces cool bright conical reflector puts light where you need it innovative aluminum heat sink maximizes switch life vinyl-coated flex arm ensures durable positioning of the light bulb: uses any a19 incandescent bulb up to 100 watts (not included) cord: 3-wire 18 gauge sjto, rated 105c, with nema 3-prong grounded plug shade: 5.75″ high, 4.5″ diameter, rotates 270