The YakAttack Stealth Pulley is engineered to be the most quiet, low profile, shielded and snag free pulley ever created for kayaks. Designed for use with anchor trolleys but great for many other applications. Teflon infused, wear resistant nylon rollers offer quiet, smooth operation and extreme durability for a lifetime of use. The shielded, snag-proof housing protects the rollers from docks, stumps, and other obstacles you may encounter on the water. KEY FEATURESFeatured in the YakAttack LeverLoc Anchor Trolley and LeverLoc Anchor Trolley Kit HDOffers a refined solution for kayak riggingOffers protection for trolley line from all anglesCompatible with almost all kayak models