Cordless Die Grinder Kit, Battery Included, Voltage 18.0 V, 20,000 RPM No Load RPM, Collet Capacity 1/4 in, Handle Type In-Line, Cordless Tool Battery Type Li-Ion, Series M18 FUEL(TM), Switch Type Lock-On, Slide, Battery Included (2) 35GJ99, (1) 481Z44, Battery Pack Replacement 35GJ99, 481Z44, Battery Capacity 5.0 Ah, 6.0 Ah, Features Brushless Motor, Fits all 1/4 in Shank Accessories, Provides Overload Protection, Tool Length 18 in, Tool Weight 4.65 lb