Check the listing for details. Pro Trucker CB Radio 3mm Mounting Bracket Brass Knobs Pair (2 pcs). Condition: New. Listed at 7.29 USD. Pro Trucker CB Radio 3mm Mounting Bracket Brass Knobs Pair (2 pcs) Listing is for 2 single brass knobs3mm brass CB radio mounting bracket knobsWill not crack or break like the plastic radio mounting knobsPro Trucker brass knobs typically outlast all other parts of your CB radio setupMade of reinforced composites to ensure durability and performance standards are met Pro Trucker CB Radio 3mm Mounting Bracket Brass Knobs Pair, total of 2 pieces per order. Tired of your plastic mounting knobs breaking or cracking? With the Pro Trucker brass knobs, you won't have to worry anymore. Made from reinforced composites, these knobs are guaranteed to last and outperform your expectations. Typically we see these knobs outlasting nearly all other parts of your CB radio setup! Pro Trucker has been the leading innovator in CB radio products for more than 3 decades. Try these knobs today, and you'll be glad you did!