These drill bits are intended to be used with our Treehouse Attachment Bolts (TAB) and treehouse lag bolts. TABs will require both a 3" Speedbor and one of the auger bits, while the lag bolts will just require one of the auger bits. For our Heavy-Duty TABs, please see our 1½" & 1⅝" ship auger selection. During installation, the inside cutting plane shaves the hole radius for clean smooth holes without pressure. A hex shank provides a secure gripping surface for the drill chuck. The cutting edges on these bits can be resharpened. A heavy-duty corded drill is recommend when installing treehouse bolts. Our TAB installation process consists of two stages: Drilling into the tree with the 3" Speedbor Self-feeding bit. This is to fit the collar portion of the TAB into the tree. Drilling into the same hole with a ⅞", 1" or 1⅛" auger bit. This is to fit the stem portion of the TAB into the tree. Our Treehouse Lag Bolt installation process consists of just one stage: Drilling into the tree with a ⅞", 1" or 1⅛" auger bit.
