These magnetic holders are delivered in pairs and are perfect if you want to mount an LED bar, work lights, auxiliary lights etc without affecting the vehicle with screws and drilling. Whether you want the smaller or larger holders depends on how big and heavy your lighting is and where it is placed (air resistance). Generally, a bar that is up to 30 ""(80 cm long and 4 kg heavy) should work with the smaller model while a larger bar of 41"" (around one meter long and 6kg heavy) will need the larger model. If you are unsure, always choose the larger model. NOTE: As the nature of the car (such as thickness of sheet metal, varnish etc.) and the size and weight of the lighting differ from case to case, common sense applies when mounting. Therefore, always ensure that the mounting can handle the intended use! In some exceptional cases, the magnetic holders may be defective for the task and another type of mounting may be more secure. Large model: • Number of magnets: 24 pcs (12 in each foot) • Length: 206 mm • Width: 87 mm (foot) • Depth / Height: 80 mm (from the feet up to the upper edge of the holder) • Distance to attachment point: 57 mm (from the plate located on the feet to the center of the mounting hole)