Keep your watch bracelet sizing tool in working order with this replacement spring. Designed to fit the Otto Frei watch bracelet sizing tool (model 180591340) as well as a wide variety of other similar-style tools, this spring is an essential spare for any watchmaker's bench. Features Direct replacement spring for watch bracelet sizing tools Compatible with the 180591340 bracelet sizing tool and many similar models Helps restore full function to a worn or broken sizing tool Compact and easy to install Specifications Sold As Sold by the piece Application Replacement spring for watch bracelet sizing tools Notes This spring is confirmed to fit the 180591340 watch bracelet sizing tool and is also suitable for a wide variety of other similar tools. Verify compatibility with your specific tool before ordering.