EFFICIENT ASCENTS: The benchmark chest ascender designed for rope ascents; keeps the body upright and allows for a smooth glide up the rope. WIDE CHANNEL (Large Version): The CROLL L (B016AA00) features a wider rope groove that limits friction, making it ideal for use with wide-diameter (8-13 mm), swollen, or stiff ropes. DURABLE DESIGN: Both versions feature a stainless steel wear plate (or reinforced channel) to improve durability against rope friction. RELIABLE GRIP: The toothed cam with a self-cleaning slot optimizes performance under difficult conditions, such as frozen or muddy ropes. EASY OPERATION: The ergonomic safety catch is integrated into the body of the ascender to prevent snagging and allows for simple, one-handed opening. The Petzl CROLL is the benchmark chest ascender for efficient rope ascents. Designed to be used in conjunction with a handled ascender (like the ASCENSION) or a basic ascender, the CROLL sits flat against the chest to facilitate a smooth glide up the rope. The toothed cam with a self-cleaning slot ensures optimal performance even on frozen or muddy ropes. Available in Two Sizes: CROLL S (Small): Lightweight and compact. The rope channel is reinforced with stainless steel for durability. Compatible with 8 to 11 mm ropes. CROLL L (Large): Features a wide rope channel for excellent fluidity on wider, swollen, or stiff ropes. Compatible with 8 to 13 mm ropes. Specifications: Material: Aluminum frame, Stainless Steel cam/wear plate Certifications: CE EN 567, CE EN 12841 type B, NFPA 1983/2500 Technical Use Warranty: 3 Years