ACRO 21000 - X-Warning Line, Set of 4 with Flags

The ACRO 21000 X-Warning Line Lightweight System provides a fast, portable safety perimeter solution for contractors working on roof and ground-level applications. This all-steel kit includes four 42-inch posts and 100–130 feet of high-visibility warning flag line. Setup is swift—unfold each base into an X, install the post, wrap the warning line, and secure with sandbags, cinder blocks, or screws. Lightweight and reusable, the system meets OSHA warning line requirements and collapses for compact storage, all while delivering strong visibility and enforcement of safety zones on job sites.

Key Features:
• Includes four 42″ posts and 100–130 ft of pennant flag warning line
• Rapid X-base design enables tool-free setup and take-down
• Lightweight, reusable, and easy to transport between job sites
• Compliant with OSHA perimeter warning line regulations
• Powder-coated safety-yellow steel ensures high visibility and durability

• Model: 21000 – X-Warning Line Lightweight System (Set of 4)
• Components: Four 42″ high steel posts, X-base mechanisms, and flagged warning line
• Warning line length: 100–130 ft of pennant flag chain
• Materials: Powder-coated steel (safety yellow)
• Setup: Expand X-base, insert post, attach flag line, add ballast or fasteners
• Weight: Approximately 36–39 lb per complete kit
• Storage: Collapsible design for compact storage and ease of transport
• Compliance: Meets OSHA standards for warning line systems

• Expand each base into an X configuration on the surface.
• Insert a 42″ post into each base and ensure it locks into place.
• Unroll the flagged warning line and wrap it around the posts, interconnecting them.
• Secure the bases with a minimum of 20 lbs of ballast (e.g. sandbags or cinder blocks), or fasten with screws into solid substrate.
• Confirm the warning line sags to a minimum of 34″ and maximum of 39″ above the work surface, per OSHA standards.
• To disassemble, remove ballast or fasteners, collapse posts, and collapse the bases for storage.

Q: What’s included in the 21000 kit?
A: Four 42″ steel posts, corresponding X-bases, and 100–130 feet of flagged warning line.

Q: How is it secured to the surface?
A: You may use ballast of at least 20 lbs (like sandbags or cinder blocks) or fasten via screws to secure the base.

Q: Is this system OSHA compliant?
A: Yes—it meets OSHA requirements for warning line systems on roof and ground applications.

Q: How much does the line need to sag?
A: The lowest point must be no less than 34″ above the walking/working surface, and the highest no more than 39″.

Q: Is it easy to transport and store?
A: Yes—it collapses compactly for efficient transport and storage on job sites.