Fully Modular, Free Standing Skylight Guardrail 4 feet by 4 feet square Other sizes available Fully Modular The Kee Dome system features a number of standard components which can be rapidly assembled around the designated area with maximum speed. These include vertical posts, hand and knee rails together with associated 90° corner connectors, and special recycled PVC feet with clamping rings. Once the steel tubing rails have been cut to size, they can be locked into position by the corner connectors. The adjustable clamping rings are used to fix the feet securely to the corners of the roof light base, which can be up to 4m2 in area. As a result, the system remains completely free-standing, eliminating the risk of damage to the roof membrane.