Heavy Duty Guardrail (Cored-in)Heavy Duty Guardrail (Cored in) Unmatched Strength and Durability Heavy Duty Guardrail System is the industry's strongest and most reliable industrial guardrail solution for protecting your warehouse and facility's most valuable assets , people, products, and equipment. Available in multiple lengths and heights, steel guardrail is sleeved in a durable HDPE plastic and available in both one line and two line options. Thanks to the plastic sleeves, the