Toilet Seat Bolts, Made For Thick or High Toilet Seats, Two Hinge Bolts, Nylon Plastic, 4 Inch By 3/8 Inch Heavy Duty Bolts with Rubber Washers and Easy Screw Hex Nuts For Thicker Toilet Seats, hinge 3/8-Inch x 4-Inch plastic bolts with nuts and washers. 4 inches long. can be cut easy after install to the right length. Four inches will make sure you get the right size. Why guess what length You need. Cut off the plastic bolt If needed after you install seat for an exact fit..