Safety Protection: Chain brake hand guard designed for 066 MS650 MS660 chainsaw models, offering enhanced operator protection during cutting operations and forestalling potential injuries from chain kickback or debris High Quality Material: Manufactured with impact-resistant composite materials that withstand harsh outdoor conditions while maintaining structural integrity throughout extended use in challenging forestry environments Perfect Fit Compatibility: Precisely engineered to fit 066 MS650 MS660 chainsaw models (part number 1122 790 9101), insuring secure attachment and proper functioning of the chain brake mechanism for reliable safety performance Easy Installation: Simple replacement process requires minimal tools, allowing quick attachment to your chainsaw without professional assistance - restore safety features to your equipment in minutes with straightforward mounting points Reliable Performance: Activates quickly during emergency situations to stop chain movement, reducing risk of injury while maintaining consistent functionality in various weather conditions and work environments - essential safety upgrade for professional and occasional users alike