Carbide scraping chips.  Use this for removing glue, thinsets and mastics.  Four sided carbide chip provides 8 surfaces for removing soft coatings like carpet glues and rubber backed adhesives.  The teq-lok system is a user friendly system for changing tools on rental grinder.  It allows for quick changing of tools for scraping grinding and even polishing.  The tool simply slips into the slot on the floor grinder plate and is pulled or tapped outward to seat the tool securely.  Never hit the carbide segment directly when removing or installing.