RS498-823 Black brushed anodised aluminium knob by RS components. 28mm diameter x 14mm High, with a 6.35 mm shaft hole, fixed by the included grub screw. Status: perfect VNOS (Very New Old Stock) individually packaged in original unopened RS wrappers. Actually, quite a nice, classy looking knob, fine for audio (potentiometers and switches alike) or up market industrial equipment. RoHS compliant: YES