The Delta Prevention HGKTOS01 aluminum guardrail kit for roof access hatch can be installed on standard size hatches where the curb dimensions are up to 104" x 52". A minimum vertical profile of 3" is required for the installation. This modular kit is engineered with heavy-duty 1.9" OD anodized aluminum tubes for corrosion resistance and a durable architectural appearance. It features an adjustable aluminum swing gate, a grab handle to facilitate ingress and egress of the hatch, a landing area at the ladder exit and our unique clamp-on system providing a 100% perforation free installation. Complies with OSHA 1910 General Industry Standards and 1926 Subpart M Construction Standards.