Aluminum main housing and cap is more durable than magnesium for punishing roofing environment * Tool-free adjustable depth-of-drive for consistent and controllable nail set * Comfort and convenient features include: durable molded comfort grip, 360 Degrees tool-free adjustable exhaust and adjustable shingle guide * Steel wear plates reduce shingle abrasion on tool * Weights just 5.4 lbs. for easy one-handed operation