Equipment all have Quality Grades. The grade determines the number for basic stats.
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In order to change the grade of equipment, you must purchase Gear Lubricant (유니온 기어 윤활제). Plane Gate gear requires its own special Gear Lubricant. (차원의 기어 윤활제)
A guide to preform re-grading can be found on the HQ.
Be advised that Gear Lubricant will give the equipment a random grade.