Each structural part manufactured by Streifeneder ortho. production is marked with a serial number and lot numbers to ensure quality control of all parts. This facilitates the quality management of our customers and allows for a comprehensible and continuous documentation. Please do not allow the torque wrench to click more than once –  further tightening will increase the torque, which may result in damaging the modular component. Please bear in mind that once a year the torque wrench should be recalibrated per ISO certification standards. We would be glad to offer you this service.