The Gotoh VK1-19 knob is a style of control knob made by Gotoh and used on several models of Ibanez guitars, primarily those made in Japan.
It is a round, machined metal knob with medium course diamond knurling on the sides and a domed flat, polished top. It fits a 6mm fine spline, split shaft potentiometer. A small retention screw on the side ensures a solid fit.
It is similar to the Tek Grip knob.
- VK1-19 product description, Gotoh Gut Co., Ltd., archived September 2020