Click on the hole and AMMApA adapter for centering drill - ready to go: 1. By pressing the button on the adapter, the hole and AMMApA are unlocked. 2. Slide forward and replace. Lightning-fast removal of the drill core: By pressing the push button on the Drill & Drop hole and AMMApA holder once, the removal of the drill core can be done very quickly and without the use of additional tools. Extreme angled drilling settings made easy: 1. Release the hole and AMMApA using the button on the adapter and pull back. 2. Pre-drill the angled setting with the centering drill. 3. Then push the hole and AMMApA back forward until it locks. 4. The hole can now be drilled at the desired angle. Enlarging existing hole diameters: Using the Drill & Drop holder makes it very easy to enlarge a hole by simply adding another hole and AMMApA. The small hole and AMMApA, which is pushed onto the hex shaft from the back, serves to center it. The enlargement is then done with the larger hole and AMMApA that is pushed over it.