Durable and Reliable Tree Climbing Spikes: Safely ascend trees with these robust climbing spikes, crafted from durable 42CMOR steel and rigorously tested to meet ASTM-F887 standards. Designed to support up to 350 lbs., they ensure stability and reliability during climbs. Adjustable hook-and-loop straps keep the spikes securely fastened to your legs, while EVA padding and contoured thigh plates enhance comfort for extended use. The frame height can be customized between 15.53 and 17.3 in. to suit individual preferences. Note: The included utility rope is intended for positioning and general use only and is not certified for fall protection. Durable Steel Construction,Improved Safety Measures,Designed for a snug and pleasant experience,Robust and Long-Lasting Spike,Customizable Height.