Dynabrade 53502 .5 hp Straight-Line 20000 RPM Extension Die Grinder, Teal Includes 1/4-Inch Collet Insert (01485), fits optional 1/8-Inch (01495), 3 mm (01496), 6 mm (01497) Extension Die Grinder has 7-1/4-Inch workable reach Extended rear exhaust muffler design