Protective Boot Adapter: This adapter allows your Simon Tools M12 bit holder to mount securely on Milwaukee M12 impact drivers with protective boots installed. Fits All Variations: Works seamlessly with all versions of Simon Tools M12 bit holder, including Gen2, Gen3 and left- and right versions. Easy Installation: Install the adapter between your M12 drill and bit holder for instant compatibility with the protective boot. Must-Have Accessory for M12 Users: If you use a Milwaukee M12 bit holder with the protective rubber boot, this adapter is the perfect upgrade to keep your setup fully functional. Bot adapter for Simon Tools M12 bit holder