Skid shoes protect the your snow blower and surfaces you are clearing with a snowblower such as a driveway or sidewalk. Replacing damaged or dull skid shoes keep these surfaces protected from scraping and scratches and preserves the auger housing, extending the life of your snow blower. The RYOBI Skid Shoes are compatible with RYOBI 40V 2-Stage Snow blowers RY408150/RY40HPSN04B & RY40870/RY40HPSN05B and include (2) skid shoes.