The Truth Casement Handle Aluminum-2-3/8" is used on many aluminum windows manufactured from the 1970's. This handle is the same as the Wi2423, but the lock up dimension is 3/8". The lock up dimension is the distance from the back of the handle mounting plate to the inside surface of the hook when it is closed. The handle features die cast construction, and is then powder coated to the desired finish. Aluminum and white in stock, call for other colors.