KLS telescopic edge profiles are L-shaped and made of aluminum or stainless steel with perforations along the main fold for continuous drainage. The 2 m long pieces have an insert of the same length, making it extensible and easily joinable, saving time and making cuts unnecessary. It provides vertical separation between gravel and growing media, it can also be used for edging green roofs until 12 cm media depth. Typically they are self supporting and require no membrane penetrations. KLS gravel boards are also available in stainless steel.