Standard Guardrail (Cored)Standard Guardrail (Cored) The New Standard for Industrial Guardrail Standard Guardrail System is the market's premier, cost effective industrial solution to protecting your warehouse and facility's most valuable assets , people, products, and equipment. Our Standard Guardrail Systems are built with 4" schedule 40 steel pipe rails & 2 1 2" schedule 80 steel pipe posts. The systems are available in both one or two line rails and are sleeved in a