Century Drill and Tool 38113 12-Inch Ship Auger Drill Bit Extension, 1/2-Inch Go to amazon.com Related posts Top 15 recommendation auger extension for 2022 FeatureSecurely grips ship auger drill bits for extended lengthFor use with ship auger bits with 1/2" hex shanksExtension's shank fits -Inch drill chucks12-Inch length DescriptionSecurely grips ship auger drill bits for extended lengths.