WIN.MAX Sit Up Bar for Fitting the waists with Foam Handle & Steel (Black, Pack of 1) This bar helps build stomach muscles for a flatter, slimmer look The heavy-duty foot bar adjusts to 3 different positions Slide underneath the door and tighten knob to secure the bar. Made of strong steel plate and tube with rubber padded clamp, firmly fixes to the door, with thick rubber foam for an easy & comfortable work out The rubber-padded clamp protects door and adjustable to fit securely to any door