Pack of 5 Spring Washer For 105-135 Gear Box of 4 Stroke (178F, 186F, 188F & 177F) Power Tiller contains five high-quality spring washers designed specifically for the gearbox assembly of 4-stroke power tillers with engines 178F, 186F, 188F, and 177F. These washers help maintain tension and absorb vibrations to secure gearbox components.