30mm diameter black control knob from SCI with spun aluminium skirt and inlay. * Line indication * Diameter 29.4mm * Depth 18mm * Grub screw fixing for 6.35mm (0.25in) spindles https://elecena.pl/product/27199133/sci-rn-113b-line-indicator-control-knob-30mm 2024-11-09 https://elecena.pl/product/27199133/sci-rn-113b-line-indicator-control-knob-30mm 2026-07-04