Quick Change System for More Efficiency - Attaching the pilot drill to the adapter has always been a difficult task. This costs professionals time and money. With the Expert Power Change Plus, you can change the pre-drill bits within seconds thanks to the clever one-click adapter from Bosch This keyless system does not need to be secured with screws or bolts. One hole saw is simply pushed out and another is pushed in. Despite this obvious simplicity, the EXPERT Power Change Plus still offers a firm connection: thanks to a reinforced shaft and a tight-fitting guide drill, it actually has less backlash than traditional systems. The Bosch EXPERT Power Change Plus Hole Saw System is designed to provide users of hole saws with the best connection with maximum efficiency. So they save time and do the most difficult tasks at a high level. For use with the Bosch Power Change Plus quick release adaptor: for accuracy and robustness