Abstract: A height adjuster (100, 200, 400) for a seat belt system comprising a mounting bar (102, 202, 402), a carrier (120, 220, 460, 460a) and a spring-loaded locking lever (170, 270, 490). The mounting bar is preferably oval or rectangular in cross-section with at least one wall (side wall), which acts as an engagement or locking surface. The engagement surface can include a plurality of small teeth. The bar is adapted to be mounted to a support surface or structure. The carrier is slidably mounted on the bar and is movable to different positions. The carrier includes a main portion, which may be U-shaped in cross-section with a top, a bottom and a center wall. Each of the top and bottom walls includes a first opening through which the mounting bar extends. A friction force generator or friction enhancer pushes the lock lever laterally into a side of the mounting bar.