Toilet Bolts, Toilet Seat Hinge Bolts, Nylon Plastic, 3 Inch By 3/8 Inch Heavy Duty Bolts with Rubber Washers and Easy Screw Hex Nuts Toilet seat hinge 3/8-Inch x 3-Inch plastic bolts with nuts and washers. 3 inches long. can be cut easy after install to the right length. Three inches will make sure you get the right size. Why guess what length You need. Cut off the plastic bolt after you install seat for an exact fit..