Musclechuck™ have invented and developed a totally new high speed quick change router chuck, it is called the "Musclechuck™ assembly" and when you examine the specifications of this new chuck, you will understand why we chose that name.
Disclaimer: Power tools and their accessories, such as the “Musclechuck™” assembly, should only be used for their intended purpose by users experienced in their operation. Careless handling or misuse may result in serious injury or death. Failure to follow the enclosed directions is a misuse of the “Musclechuck™” assembly. The user must always make sure that the cutter is secure in the chuck, especially when a reduction collet is being used BEFORE turning on the router.