This is Aluminum Trailer Light Bracket for mounting trailer lights to the rear of your boat trailer. This Light bracket features standard hole spacing for mounting all standard trailer lights. The Aluminum Construction makes this light bracket ideal for boat trailers as it will not rust. You would mount this bracket using bolts, directly to your trailers frame. The L Shape of the bracket sets your trailer lights in the perfect location for visibility while towing. This bracket can be used on both sides of your trailer.