This horizontal flag mount has an industry standard 1/2" hole machined on the top.  Requires 2 strap clamps (MODCL) to hold it so that it will not rotate on the bar at high speeds.

WARNING: Cancer and Reproductive Harm -  www.P65Warnings.ca.gov .  PRODUCT WARNING/LIABILITY DISCLAIMER:  Aftermarket accessories are intended to modify and/or prepare a vehicle for uses which exceed conditions anticipated by the vehicle manufacturer. These uses include high performance demands and negotiation of rough terrain. These conditions have extreme variance and cannot be controlled by the vehicle manufacturer or aftermarket accessory manufacturer. Therefore, the safe control of your vehicle is entirely your responsibility. Do not purchase parts unless you are willing to accept this responsibility. Do not install any part that you do not feel competent at installing without causing present or future injury to yourself or others; consult a professional installer.  Modification of your vehicle to enhance performance can result is dangerous situations that may result in bodily harm. The buyer hereby assumes all risks associated with any such modifications. The seller will not accept responsibility for personal injury or property damage arising from the failure of any parts.