Configured in haul systems these blocks will enable the user great versatility in a personal mechanical advantage system suitable for rescue and general rigging. Engineered to withstand over 8,000 lbf. (36kN). The set comes in two colors for ease of identification. One configuration provides a 5:1 mechanical advantage. Turn it around for a 4:1 with change of direction. Progress capture ratchet prusik can be attached at either end. One quick pin with each set of blocks. Additional pins my be purchased separately.