MTD shear bolts for 2-stage snow blowers manufactured in 2004 and prior (except 33 In. Model E9931). Helps protect a snow blower from damage when the impeller comes in contact with a solid object. Includes bolts and 4 hex nuts. Stage: 2-Stage Length: 1-1/2 In. Warning: Cancer and Reproductive Harm - www.P65Warnings.gov -