fits snugly into the receptacle on 51 on the drill bit assembly 50 while the finger 53 on the drill bit assembly 50 fits into the receptacle 23 on the top bracket 22 even if the bolt 2 were to become loose or break this self locking interlock would help ensure the drill bit assembly 50 stayed securely positioned in the top bracket 22 fig2 also shows the positioning of the bracket sets 20 on the hollow auger head 10 relative to the auger pin 12 and each other the positioning of the bracket sets 20 and as a result the drill bit assemblies 50 on the hollow auger head 10 relative to each other is an important consideration in the functionality of the hollow auger head assembly 100 the arrangement of the drill bit assemblies 50 on the hollow auger head assembly 100 is such that the finger bit or bits 60 on a drill bit assembly 50 loosens material and feeds it to the blade 56 on the next drill bit assembly 50 on the auger head assembly 100 for further processing proper positioning of the drill bracket sets 20 on the hollow auger head 10 ensures that the drill bit assemblies 50 are properly positioned so that the loosened material is delivered to the blade 56 of the next drill bit.