C.E. Smith 40" PVC Post Guide-On [27620]PVC Post Guide On Adjusts Out to 13" each Side Fits Frames up to 3"W x 4 1 4"H 1 1 2" sq. 16 ga Pre Galvanized Steel post Extends 18" Into 2" PVC tube for strength WARNING: This product can expose you to chemicals including LEAD,Chromium (hexavalent compounds) which are known to the State of California to cause cancer, birth defects or other reproductive harm, and NICKEL (METALLIC),COBALT METAL POWDER,BERYLLIUM which are known to the State of