Can this be used for stair railings and if so is there special hardware or no?

Hello, and thank you for choosing Trex for your project! Our Enhance kits come in two different types: Horizontal and Stair. It should specify on the box which application the kit is designed for. The hardware included in the stair kits is slightly different than the horizontal, so you will want to be sure you are using the right kit. Thank you for your question, and please feel free to reach out to us if you have additional questions or concerns. Thank you - Garrett Felix - Trex Customer Care Team.