●The iron ring cordless support is upgraded from plastic ring to metal ring, which is more durable and not easily damaged in the hot sun and cold winter. ●The installation is simple and easy to operate, suitable for left and right installation, and the crank rod can be linked for 90 °,180 ° Adjustment. ●Hand rolling shutter control system, universal mounting metal bracket, black. ●It can be used with 38mm and 28mm pipe plugs ●If you need more help, please feel free to contact us. I will serve you wholeheartedly. Thank you!