Tee Nuts come with various barrel lengths.. (It is important to note due to Timber thickness). Tee nuts are commonly used to create a internal thread in Timber.. They can come with a variety of prongs which once the barrel hole is drilled they are then Hammered in with a Hammer. Note Tee nuts can be pulled out if the force is the opposite to the directional implant.. Ie Tee nuts are for Sheer force(Downward or Upward) only due to their Application. Commonly used in Mounting Finger/Footholds (In conjunction with Socket head cap screws) in Climbing structures..