DoubleBack buckle allows for rapid length adjustment Petzl STRING attached - holds the carabiner in place and protects the carabiner from wear Hole in buckle for attaching a secondary cord to help adjust The loop on the free end of the webbing to attach a piton during placement Foot retention system helps keep the foot in the step while ascending The Petzl QUICKSTEP Adjustable Single-Step Etrier is an adjustable etrier to aid in ascending. The DoubleBack buckle allows for rapid length adjustment and has a 3mm hold in the buckle for attaching a secondary cord to help quickly adjust the etrier. The foot retention system also allows for struggle-free ascending and helps keep your foot in place while doing so. Specifications: Weight: 142 g Materials: Nylon Webbing DoubleBack buckle of aluminum and steel