Usage varies by application, see model note for specific use.Gas Struts assist in safely opening and closing doors, hoods & windows on a wide variety of equipment. Gas Struts are also commonly referred to as Gas Shocks or Gas Springs and are available in a wide range of lengths, materials, and forces.Read more about Hy-Capacity’s Gas Struts in our blog!The HR234988 Rear Window / Fuel Tank Deck / Battery Box / Step Gas Strut, 13" fits equipment brands such as: John Deere