Irwin Tools 43805 Auger Bit Extensions, 18" Go to amazon.com Related posts Top 15 recommendation auger extension for 2022 FeatureAuger Bit ExtensionsExtension adds 18" to regular bit lengthSix-flatted shank provides better chuck grip and reduces slippageHex key included DescriptionIRWIN Tools Auger Bit Extensions, 18-inch (43805), Auger Bit Extensions, Extension adds 18" to regular bit length, Six-flatted shank provides better chuck grip and reduces slippage.