The most popular size and comes stock with any NRS frame is the NRS Frame 6 in Oar Mount. The NRS Frame 6 in Oar Mount is new and improved, it features increased strength and is 25 percent less weight due to its forged aluminum structure. The NRS Frame 6 in Oar Mount will fit any standard size 5/8in oar lock. This new oar mount comes with a nylon bushing and is easily replaceable if it comes out. The NRS Frame 6 in Oar Mount fits any 1-5/8in OD pipe. A pair of NRS Frame 6 in Oar Mounts comes with two U-bolts, nuts and washers. Single mounts do not come with any hardware.