High Speed Changing Hole Saws and Drill Bits! Hole saws are a great accessory, but attaching them to your drill was always a fiddly job to do accurately. This costs professionals time and money. With the EXPERT Power Change Plus, you can switch hole saws in seconds thanks to Bosch’s clever one click arbour. The Bosch EXPERT Power Change Plus Hole Saw System is designed to give hole saw users the best connection with the maximum efficiency. It will save you time and perform the roughest tasks to a high standard.