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 appealing. It's the type that is tightened with a hex wrench. It supports an inner diameter of up to 6mm. 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. This is a version with a slightly narrower anti-slip grip. The included accessory is a hex wrench.