PVC Post Guide-OnAdjusts Out to 13 each SideFits Frames up to 3W x 4-1/4H1-1/2 sq. 16 ga Pre-Galvanized Steel post Extends 18 Into 2 PVC tube for strengthWARNING: 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 California to cause cancer, and ARSENIC ,CADMIUM which are known to the State of California to cause cancer or other reproductive harm. For more information go to P65Warnings.ca.gov.