This listing is for a pair (2) spring bars. Charmont Watches offer sets of replacement spring bars for different Rolex models. These spring bars are custom made to the exact tolerance, size and quality that Rolex uses. The spring bars offer Rolex owners an affordable option for replacement spring bars. These spring bars are exact replacements for the Milgauss. The spring bars measure 1.8mm thick by 20.0mm long. The internet is strewn with tales of watch owners who have bought cheap spring bars which have failed at the point of pressure being exerted upon them resulting in serious damage to their watch. Do not skimp on spring bars - and ensure you buy quality spring bars like these.