Rolex Datejust 36mm (6 digit) Spring Bar 1.8mm by 20.0mmEverest offers sets of Rolex replacement spring bars for different Rolex models. The 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 Datejust 36mm (6 digit). The spring bars measure 1. 8mm thick by 20. 0mm long.