The 4075 Standard Box Newel is 3 1/2″ x 55″ with a solid core. Box posts are very versatile and can be used with any baluster design, from wood to iron to create a wide variety of styles and designs. In addition, there are a number of accessories to customize your design. For an adjustable sleeve see the LJ-4175 box newel post. Please contact us directly if longer lengths are needed.