1. lead brass 2. Larger Rubber Washer, Better secured: Upgraded rubber washer of this wall mount faucet installation kit (1.75") is larger than the other brands kit (1.5 "). It's features completely cover the backsplash hole, It does a good job of securing the wall mount faucet to the commercial sink as long as the hole is less than 1.5 inches in diameter. No longer to worry about the rubber will get stuck in the hole and damage because too small and too thin 3. Premium Lead- Brass: Built to last. Sink installation kit is made from premium quality brass. This faucet installation kit never crack in the extreme temperature range: -22℉ to 248℉. Every installation kit is tested and inspected for impeccable grade before selling 4. Non-leak Design: This commercial faucet installation kit is one-piece lead- brass construction which can't separate. Solid brass lock nut, metal washers and rubber washers do their work together for better sealing. Get rid of the leaking 5. Space-Saving Wall Mount Faucet Kit: This sink installation kit for tight spaces. Our mounting kits are engineered to 90-degree elbow connectors, keep your sink installation neat, and save you a few inches of precious behind backsplash space