This set of four Norralco Orthopedic Retractors is a premium quality tool for surgical procedures. Made in Germany, these double-ended retractors have 57mm/769mm ends and are 12mm wide. They are specifically designed for use in orthopedics and are a reliable addition to any orthopedic surgical toolkit. The Doane Z-Knee Retractors are a must-have for any medical professional looking for high-quality instruments.