19 positions for 19 instruments. To facilitate a safe handling of the surgical instruments during the cleaning and sterilization processes reducing the risk of injures.. GAMMAFIX locking system keeps the tray perfectly closed in all conditions. Safe and easy joint system, totally hygienic. Holes? dimension assure a perfect washing process and a safe sterilization. Open corners allow residuals and water to flow out from the tray and reduce drying time. The mark shows the opening position (lateral) and closing position (UP)..