The Guardian Fall Protection Guardrail Knuckle is the ideal base attachment solution for permanent guardrail systems. The Guardrail Knuckle installs easily with two lag bolts, and is perfect for use on a variety of substrates. It is compatible with all Guardian Fall Protection G-rails, which are available in 6, 8, 10, and 12 ft lengths. Manufactured from galvanized steel, the Guardrail Knuckle will last a lifetime, and when used in combination with a compatible guardrail, forms the foundation for a high-performing fall prevention system.