Help with a high speed grinder attached to a long handled with small gas engine

Can anyone help with a name of company or manufacturer who sells and markets a high speed grinder used to remove asphaltic coatings/cements from metal roofs. This grinder is ised by workers standing up and is high speed type. My guys are tired of doing this on their knees. Any help anyone has would be appreciated. Thanks! New the this forum and love it. Stay warm.