Rubber Insulated Clamps are ideal for securing suspended cables, circuits, pipes, hoses, etc. The flexible clamps adapt to fit snugly, holding lines firmly in place while protecting from shock, abrasion and vibration. Clamps are measuring by inside diameter of clamp when closed. The aluminum clamps are strong, durable and long lasting, in a variety of sizes to fit any type of mounting application. 1/4" Mounting Hole