The OH277T is an easily installed basic T-Top Holder. Perfect for any horizontal mounting surface such as a T-top, Hard-Top, Standing Platform, Radar Arch, etc.. The OH279S is our side mounting version. It is designed for vertical surfaces such as the side of a Radar Arch, Tower, Wing Wall, etc.. The inside diameter of these holders is 1-1/2" like our heavy duty Large Skiff Holder. These two holders are very easy to operate. Their simple and uncomplicated design insures reliability. By actuating a simple release mechanism, the holders rotate from their normal raked back running position to a fishing position that has been optimized for their location. The installation of the holder is simplified since only the bolts securing the holder actually penetrate the mounting surface. Of course, the mounting surface must be suitably constructed or modified to accept the holder.