Our C3014 Series Showcase light can be use as individual 18" or 28". It is linkable so you can make combinations from 18" and 28" to meet your showcase size need. 2 mounting clips include with each light. It includes a UL Listed Power supply to ensure the longevity of your investment. Try one out today!! Additional Details ------------------------------ Product description: Our C3014 Series Showcase light can be use as individual 18" or 28". It is linkable so you can make combinations from 18" and 28" to meet your showcase size need. 2 mounting clips include with each light. It includes a UL Listed Power supply to ensure the longevity of your investment. Try one out today!! Support phone: 773-581-9083 Support Website: www.ledupdates.com