Shear Pins protect your snow blower from being damaged by obstructions such as ice, rocks and other debris caught in deep snow. These pins are designed to break at a designed load if the auger jams or clogs in order to limit damage to the gear case and impeller. The RYOBI Replacement Shear Pins are compatible with RYOBI 40V 2-Stage Snow blowers RY408150/RY40HPSN04B & RY40870/RY40HPSN05B and includes (4) bolts and (4) lock nuts.