any pics of mantle heat shield????

i either need to move my mantle or install a heat shield. current chimney is painted white. im wondering if anyone has pics of a mantle heat shield installed. im trying to get my arms around what they look like. i have seen pics, but it looks like a black square tube. or, is it a triangle

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HomeSaver Heat Shield Mantel for Fireplaces Protect your mantel and woodwork from the high temperature heat with the HomeSaver Mantel Heat Shield. This fireplace heat shield can be easily customized to your mantel size and secure it using the provided hardware. A versatile heat shield that is designed to protect your mantel and surroundings from the intense high-temperature heat of your stove.

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