The Quick-Fit Bit system is unlike any other bit in stained glass! It is designed to be quick to change without the use of a hex wrench or other tools like conventional grinder bits. With a flip action of the holders lever, you can change your bit, or the grit of the bit, in seconds! Theres no need to find and use keys or locking tools - no grinder freeze-ups! Includes full Quick-Fit Bit system - rugged plastic holder and diamond bit sleeve. Fits The Grinder and all Gryphon and Glastar grinders except G8.