Durable Natural Color Nylon Clamps for mounting and channeling wire bundles, cords, pipe, tubing, etc. Bottom mount hole is slightly elongated for adjusting to get a snug fit. Clamps are measured by inside diameter of closed clamp. Best fit is achieved by measuring outside diameter of bundle, tube or pipe to be clamped. Excellent electrical insulating properties, fuel and oil resistance and mechanical strength. Natural Nylon is not UV resistant.