Swing side aluminium pulley - The swing-side aluminium pulley has plates that swing open to install rope. Particularly useful for use when doubling the line, the rope cannot accidentally come out of the block. Use the steel locking carabiners or shackles to anchor to a polyester sling. The 2-1/2'' diameter aluminium pulley is mounted on self-lubricating bushing and stainless steel axle. The swing sides are also made of anodized aluminium.