NRS Oversized Frame U-bolts are stainless steel coined U-bolts for use with LoPro Fitting. Includes 2 zinc-coated steel nylon-insert lock nuts and flat washers. 2 5/8″ deep Oversized U-bolt are used in the NRS Raft and Cataraft Anchor Systems, Lower Cat Rail Spreader Bars and Cataraft Frame Aluminum Floors. Folks building their own custom frames or building custom applications may also find use for these U-bolts.