Plate 1857/1857T Application For espagnolettes with lock or seal shall be operated with a square handle 51 or triangular key 145. Are not recommended when there is a risk for spontaneous opening. (In such cases, ASSA 805 + 811 is recommended, page G 144.) Material Stainless steel White, acetal plastic Downloads Ritning-Bricka-1857 (.tif, 40 kB) Close Triangular key ASSA 145For operation of espagnolettes with triangular pin ASSA 5… Triangular pin 56For espagnolette operated with triangular key ASSA 145. N… Cover plate 823For situations where handle holes need to be covered. Do you want to create a safe lock environment? ASSA OEM has created "The lock guide by ASSA OEM", and it's made to give you knowledge and tips about approved lock sets. We really encouring poeple to read our tips and guidelines here: The lock guide Want to download our product catalogues? If you prefer to download our product catalogue - you can download it here! We also provide instructions, declarations and other documents in our download documents section.Check it out!