This is an aftermarket product imported from overseas. It's a heavy metal knob featuring Gretsch's "G" and an arrow design. The way the arrow indicates the markings is quite clever. It's the type that's tightened with a hex wrench. It fits up to a 6mm inner diameter. It fit perfectly on Gibson's genuine inch pots. It can be used for both inch and metric pots. Please note that it is not compatible with solid shafts of 6.3mm. Included are 4 knobs and a hex wrench. Notice: The width of the anti-slip grip has become slightly narrower, as shown in the image, starting from this shipment.