Petal‑type anchor bolt nut is a blind expansion fastener for thin sheet metal and hollow substrates. When tightening the matching screw, the multi-petal body folds and expands outward behind the panel to form a large supporting area. It can be installed only from one side of workpiece without backside access. Material: carbon steel, stainless steel; finishes: blue-white zinc plated, color zinc plated. Widely used for license plate, cabinet, thin metal and hollow wall fixing.