Greetings. I have read someplace that the Craftsman,Ryoby, and Rigid cordless tools were all made by the same manufacture. Is this for all Craftsman tools or just for specific items. My local Sears has the high impact 300ftlb with Lithium Ion 4 amp battery and charger for $179.The Sears line boasts about the 19.2 volts while the other brands are 18. As we are all aware that Rigid has a lifetime warranty if purchased through HD. If I am able to get the same tool for less coin should I take the plunge? Thanks, Ken