Metal guardrails; Surface non-penetrating metal guardrails; Surface penetrating metal guardrails, fixed metal guardrails; Metal guardrails for use around hatch openings; Metal walkways with metal guardrails; Metal guard rails for use around ladder access openings; Metal gates and self-closing metal gates for guardrails; hand rails of metal; Replacement and structural parts for all the foregoing; Metal anchors sold as an integral component of all the foregoing