These Faithfull Holesaw Arbor Quick Release Nuts come in a convenient pack of three and are suitable for the most commonly used holesaw sizes.They are designed to be used with the Universal Quick Release Arbor Set (FAIHSAUQC) and offer a quick and secure way to attach and remove holesaws. Includes:1 x Locking Nut #1 (14-30mm) and2 x Locking Nuts #2 (32-210mm).