Fits both round and square banisters and accommodates most hardware and pressure mount baby gates up to 37” tall; Accommodates square banisters up to 3.5 inch wide. Gate mounting kit (Gate not included) provides easy banister-to-banister and banister-to-wall installation at the top or bottom of stairs, and in-between doorways and other openings without the need to drill into banisters GATE NOT INCLUDED