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. Push 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 shrink holes made easy: 1. Release the hole and AMMApA using the button on the adapter and pull it back. 2. Pre-drill the shrink hole with the centering drill. 3. Then push the hole and AMMApA back forward until it locks. 4. The hole can now be drilled in the desired shrink position. Enlarging existing hole diameters: Using the Drill & Drop holder, enlarging a hole by adding another hole and AMMApA is very simple. The small hole and AMMApA, which is pushed onto the hex shank from the back, serves for centering. The enlargement is then done by sliding on the larger hole and AMMApA.