Mushroom blade is easy to use and works well with sealant when removing insulating glass from window frames. Recording area suitable for all brands of multi-vibration tools. Fein makes less expensive mushroom plates, but they only have a star tip. I was surprised that the blade section would loosen and detach from the attachment section. It is good that there are five blades in the kit, because for a large job you need to use several. I've also found that if you put too much pressure on the sealant, the 12 volt battery and multi-tool will get hot and stop working. Nevertheless, the blade does its job.