The Homelite SP18321H6 is a genuine OEM 18-inch (457.2 mm) chainsaw guide bar designed for optimal performance and durability. Featuring a 3/8-inch (9.525 mm) chain pitch and a 0.050-inch (1.27 mm) gauge, this guide bar is engineered to fit specific Homelite chainsaw models including UT10510, UT10511, UT10512, UT10513, UT10514, UT10515, UT10516, UT10517, and UT10518. It ensures precise chain guidance and is a critical wear item for maintaining efficient cutting operations.