The Allegro Manhole Guardrail* is designed as a simple one-piece construction that offers easy, no-tools assembly. Guardrail locks open and two hooking chains provide protected entry and exit. For added safety, the rail accommodates signs, flags, or lights. For convenience, it can be used with a guard rail tent, umbrellas or the Allegro winch.*This assembly is to be used as a “Temporary Barrier Railing” only. See OSHA 1910.146(c)(5)(ii)(B).