VISUAL SKID DETECTION: High-visibility yellow indicators provide an immediate visual alert when a commercial trailer wheel is skidding or a brake is locked, helping fleets prevent flat-spot tire damage and brake drag. HEAVY DUTY MATERIAL: Manufactured in the United States from industrial-grade UHMW-PE (Not cheap nylon like others) for long-term durability. Withstands extreme heat, freezing temperatures, and harsh road conditions COMPLETE KIT: Includes four skid indicator strips and four M22 x 1.5 jam nuts for secure installation on heavy duty commercial trailer wheel hubs. Designed specifically for vocational, long-haul, and mixed-service trailers. FLEET SOLUTION: Helps prevent costly tire damage and reduces maintenance downtime by early detection of brake-related wheel lock UNIVERSAL HD FIT: Compatible with standard hub-piloted commercial trailer wheel configurations (M22x1.5 stud - 7/8" hole) , designed for long-haul and vocational fleet applications. (Not designed for RVs, campers, light-duty, or utility trailers.) Keep your fleet running smoothly with these innovative Skid-Stopper trailer wheel skid indicators. This 4-pack of high-visibility yellow indicators provides an immediate visual alert when trailer wheels lock up or start skidding due to brake issues. Crafted from industrial-grade UHMW-PE plastic, these indicators maintain their integrity in both scorching heat and freezing temperatures without compromising performance. Each kit includes four M22 x 1.5 jam nuts for secure, reliable installation on commercial trailers. These indicators are an essential tool for proactive fleet maintenance, helping operators quickly spot potential issues before they lead to costly tire damage or unexpected downtime. Perfect for long-haul trucking operations and vocational fleets, these robust indicators are built to withstand the demanding conditions of heavy commercial use. Save time and money by catching brake problems early with these dependable visual warning devices. Compatible with standard commercial trailer configurations and designed for quick, straightforward installation. Proudly made in the USA, these skid indicators are built to meet the safety expectations of North American fleets.