This hanger bolt with newel post mounting kit is perfect for anyone looking to attach a newel post to their staircase. The kit includes a round bolt with a 1/2 inch diameter and a closed end type. The screw size is also 1/2 inch, and the thread size is nut is 1/2-13. The mandrel material is steel, and the screw is made with a flat head style. The wrench drive style is used to install the screw, and the system of measurement is in inches. The kit is manufactured by L.J. Smith Stair Systems, and the model number is LJ-3008-10-O. This product is great for those in need of a reliable and sturdy fastener for their staircase.