Retro-Fit Risers are designed to be installed over existing risers (the vertical boards between stair treads). When updating your carpeted stairs to match new hardwood flooring, you might choose Retro-Fit options rather than standard fit.
This product can expose you to chemicals including wood dust, which is known to the State of California to cause cancer. Drilling, sawing, sanding or machining wood products can expose you to wood dust. Avoid inhaling wood dust or use a dust mask or other safeguards for personal protection. For more information go to www.P65Warnings.ca.gov/wood.