-Precision Machined Rotors for Extended Motor Life -Recessed Handle For Increased Comfort and Reduced Fatigue -360 Degree Swivel Air Inlet Avoids Kinks in Air Line -Rear/Handle Exhaust Directs Air Away From Operator/ Work Surface -Improved Muffler Design Reduces Noise to 83 dBA Without Compromising Torque or Speed -Drilling Capacity: 3/8" -Air hose (I.D.): 3/8" (10mm)