Knurled straight plastic knob from Keystone Electronics with 0.250" shaft diameter. Features ABS body, spun aluminum inlay, and brass nickel-plated insert with two 8-32 set screws.
The Elesa USA Corporation 8723 is a CTL.476/30 p-M6x20 wing knob with a 32mm diameter, M6 threaded stud, and a 2-arm bar/T style design. It is made from black glass-fibre reinforced polyamide.
This TE Connectivity PKES60B1/4 is a black, fluted rotary switch knob with a line indicator and a 0.250" shaft size. It has a maximum operating temperature of 85°C.