Product Introduction: When installing the Makita rechargeable earth auger bit, please make sure the pin is locked. Also check for damaged parts. Diameter: 5.9 inches (150 mm), Effective Length: 21.7 inches (550 mm), Total Length: 31.5 inches (800 mm) Bit Standard Included Model: DG460D; Please be sure to read the instruction manual attached to this device carefully for safe use.