How to screw square cap and brush on the nail polish bottle ?
Please put the brush into the nail polish glass bottle, screw the inner cap on the bottle, and put the square cap on the inner cap straight.
The following video shows how to screw the square cap on the square glass nail polish bottle ? We screw the round inner cap first after we put the brush into the glass bottle, and then put the square cap on the round cap straightly.
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