The "FIS" F1-6930UN LC/MU 6.5mm Steel Fiber Optic Polishing Puck 1.25 Universal is a high-quality tool designed for precision polishing of fiber optic connectors. With a sturdy steel construction and a 6.5mm diameter, this puck is durable and efficient for achieving smooth and consistent finishes. The product also comes with a California Prop 65 Warning for safety awareness. Perfect for businesses in the industrial sector looking to maintain optical quality in their fiber optic components.