This wheel changer headset is a real lifesaver for car owners. It is ideal for use with 1/2" electric or pneumatic impact wrenches. The heads are made of durable material combined with Impaktor's unique design, making them reliable even under heavy loads. The outer plastic rim of the heads is made smooth to protect the wheel rim from damage when changing wheels. The inner plastic liner also prevents damage to the wheel bolt surface. The hexagonal profile of the heads ensures that the profile is accurate and maintained when screwing with high-power transmission. This means you can easily and accurately tighten wheel bolts without fear of damage.