An R-TECH control knob / button in black, compatible with PCB mounting push button switches with 2.8mm square shafts. * Type: Actuator knob * Shape: Round with domed end * Colour: Black * Dimensions: 6 x 9 mm * Shaft size: Fits 2.8 x 2.8mm shaft * Sold as single items https://elecena.pl/product/27201074/r-tech-780386-control-knob-button-for-pcb-mount-switches-in-black 2024-11-09 https://elecena.pl/product/27201074/r-tech-780386-control-knob-button-for-pcb-mount-switches-in-black 2026-07-04