Overall Length: 8"Max Drill Bit Size: 2-5/8"Optimized For Drilling Diameters Of 5/8" To 1-3/8" But Can Accommodate Up To 2-5/8" If The Bush Ring Is RemovedDust Port Can Be Hooked Up To 1-3/8" Vacuum Hose Nozzle Or 1-1/4" And 2" Nozzles When Combined With An Appropriate Adapter (Included)Dual Air Chambers Provide For Both Dust Collection During Use And Provide Suction To The Wall