MASTERCOOL brass manifold gauge sets feature durable all metal construction. The forged body is heavy duty and the hand valves are angled for ease of operation. Anti-flutter gauges give smooth pressure readings. Floating piston, double o-ring valves for long service life and smooth operation. Side mounted, metal hand valve will not crack when dropped. Gauges include R134a Fahrenheit scale in SAE and Kpa pressures. Metal bezels protect gauge lenses from breakage.