Rim-Lock #42 Lower Anterior Partial Solid Metal Impression Tray, 1/Pk. Non-water cooled. Suitable for use with a variety of impression materials. Offers firm retention of set impression material, reducing the chance of impression distortion upon removal. Construction makes them suitable for re-use following proper cleaning/sterilizing procedures. To be autoclaved at approximately 270F/134C. Solder will melt if trays are exposed to temperatures higher than 340F/170C.