Seat Dimensions 8" H x 17" W (front of seat) x 12" L Boat Hole Pattern 7.5" W x 7" L Mounting Hardware 4 - 5/16" x 18 x 1 1/4" bolts with lock washers Weight 4.5 lbs. NRS Low Back Raft Seat - The padded, waterproof, NRS Low Back Raft Seat provides a powerful and comfortable rowing station, or a nice spot for a passenger, in whitewater rafts and catarafts. This raft seat is constructed with the same heavy-duty vinyl covered pillow-soft foam used in tractor seats.