This genuine Stihl OEM oil seal is designed for compatible 029 and 039 chainsaws, helping maintain a proper seal around rotating shaft and crankcase areas. Made from durable, oil-resistant elastomer, it helps retain engine oil while preventing unwanted air from entering the engine. Its robust construction is designed to withstand the heat and vibration associated with normal operation, supporting proper lubrication and reliable engine performance. Dimensions: 17 x 30 x 4.4 mm (0.67 x 1.18 x 0.17 inches).