Dependable & hardworking comfort is what you can expect from Grammer's #MSG85/721. It's mechanical light duty suspension has a stroke of 3.9", a height adjustment of up to 3.1", weight adjustment & fore/aft adjustment that accomodates all body types for a more comfortable ride in even the most demanding conditions. Easily adjustable lumbar support for optimal back comfort. A retractable seat belt is included for safety. Some minor drilling may be required.