This section is a pair of price， croissants only black and white. The cover is locked horns unilateral (installation of a horn can be fixed with screws， and the other one is no fixed)

Tips: When installing screws， do not use excessive force， can not be forced to tighten the screws， otherwise it will cause slippery silk croissants will be scrapped.

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This section of the outer diameter is 22.2CM most suitable for installation， if the path is short， please point bold with electrical tape strip things like cross to make the trails near or at the installation standards 22.2CM

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