GENUINE PARTS ARE A MUST! This is a Shark Genuine OEM replacement part. Part Number 257FLI771. Always make sure to only use genuine OEM replacement parts to ensure the best performance of your Shark vacuum and to protect the warranty. SHARK QUALITY PARTS Two cleaning tools in one:The crevice tool provides extended reach into small spaces, while the dusting brush cleans a multitude of surfaces. CHECK YOUR MODEL NUMBER! Many Shark replacement parts for different models look the same. Make sure to match the model number on your Shark vacuum with one of the following before purchasing! Compatible model numbers: NV770 and NV771