These thicker, more substantial Guideline Posts measure 76mm in diameter, 105cm tall. Hollow base can be filled with sand or gravel for added stability. The thicker, slightly taller design of the Heavy Duty Guideline Posts makes them the perfect alternative when visibility and prominence is a must! You have the choice to either run a longer chain straight through the Post, or attach smaller lengths of chain to each post using a C-Hook (as pictured). C Hooks sold separately.