The TF-0110 King Pin Gauge by SAF Holland is a multi-purpose diagnostic tool used to inspect fifth wheel kingpins. It helps determine if a 2-inch or 3.5-inch SAE kingpin is undersized and in need of replacement. It also checks kingpin length, flatness, and straightness of the upper coupler or bolster plate-making it a must-have for trailer maintenance 💡 Key Features Undersize Detection: Identifies worn kingpins that need replacement. Multi-Function: Measures length, flatness, and straightness. Durable Construction: Built for repeated use in heavy-duty environments. Easy to Use: Simple design for quick inspections.