Free Shipping. SMC Shuttle Tandem Rope Pulley DECENT FEATURES of the SMC Shuttle Tanem Rope Pulley Uses four high efficiency sealed stainless steel ball bearings and is designed to function flawlessly under conditions that would shut down lesser grade pulleys. Sealed ball bearings provide optimal efficiency, thus reducing the performance-robbing resistance that is inherent in most multiple component systems and they are not prone to failure under misaligned loads or with twisted gear as may occur with needle bearings. Multiple independent attachment points Light weight ergonomic design Fits up to 13mm cable Oversized top hole is designed for use with rescue carabiners Low profile fasteners help to reduce snagging and hanging up when pulley is being moved. ALL CLIMBING SALES ARE FINAL.