Genuine Original Equipment Manufacturer (OEM) parts! This chain brake assembly (part number 525628901) is for chainsaws. Chain brake assembly 525628901 stops the chain when engaged or in the event of kickback. The assembly may include multiple parts; refer to your parts diagram for a complete list of parts included. Let the engine cool and disconnect the spark plug wire before installing this part. Wear work gloves to protect your hands. For Husqvarna.