This range of Expert Power Change Plus adapters allows for quick and easy switching of hole saws, thanks to Bosch's one click arbour. The key-less system does not require fixing with screws or bolts, instead the simple mechanism only requires the user to pull one saw or bit out, and insert the other. This keyless system does not require fixing with screws or bolts. You just pull one hole saw out and push another in. With a reinforced shank and close-fitting guide drill, the adapters ensure a consistently firm fit. Features and Benefits Up to 5 times faster than a standard adapter Maximum efficiency and ease of use Consistent accuracy and robustness Typical Applications Ideal for changing hole saws quickly and easily