Maxim protective eyewear prescription insert features a durable metal frame and a polycarbonate lens that absorbs 99.9 percent UV. Lens coating: DX, anti-fog hard coat. Lens color: clear. Product type: safety glasses. Recommended application: chipping, chiseling, drilling, grinding, machining, masonary, pouring/casting, power fastening, riveting, sanding, sawing, UV protection. Recommended industry: aviation, construction, food and beverage, general manufacturing, mining, oil and gas, primary metals, transportation. 20 Safety glasses per case.