We currently have two models available for our non-residential customers. Please choose the model that best fits your needs. Tape model...(Recommended for residential/light commercial users) Attaches using very strong tape. No tools required Installs very quickly, just peel-and-stick. Attaches well to almost any flat-bottom wooden or hard plastic toilet seat. Can be used immediately, but at least 12 hours before use is recommended. Will not come off under normal proper use. DO NOT install on toilet seats with curved bottoms or made of padded vinyl. Screw model...(Recommended for commercial users) Attaches using 4 supplied screws. Requires 4 holes to be drilled. Installs quickly after holes are drilled. Attaches well to almost any wooden or hard plastic toilet seat. Can be used immediately. Will not come off under extreme and frequent proper use. DO NOT install on toilet seats made of padded vinyl. Slightly curved seat bottoms are okay.