The 7 ft. safety guardrail is designed for use with MetalTech guardrail posts (M-MGPUSL) on exterior scaffolding structures. Use these vertical guardrails when you are using 7 ft platforms. For a safe installation, you need to purchase a total of 4 guardrails. The posts are designed for an easy installation due to their flattened and hole-ended features. Compliant with ANSI, CSA, and OSHA standards, a safety guardrail system is mandatory on all scaffolding platforms above 10 feet.