A shear pin (also called a shear bolt) is a safety device that connects the auger to the auger shaft. This connection enables the augers to spin, gather snow, and feed it into the impeller fan, which then ejects the snow through the chute. In the event that a large object becomes stuck between the augers and the housing, the shear pins are designed to break, preventing damage to the auger gearcase. All two-stage snow blowers are equipped with at least one shear pin on each side of the auger gear case for this protective purpose. We offer Free Delivery too.