The Flywheel starter dogs are specifically designed for Homelite 42cc chainsaws, including models UT-10540, UT-10542, UT-10544, UT-10546, UT-10548, and UT-10. These durable plastic starter dogs are compatible with Homelite chainsaws and come with a warranty for added peace of mind. Easy to install and requiring no assembly, these flywheel starter dogs provide reliable starting power for your chainsaw, making them a practical and essential accessory for any yard, garden, or outdoor living space.