... U-clamp.BEZEL MATERIAL:Steel black bezel, steel bezel, chrome plated bezel, brass bezel, steelroll ring (or bayonet threaded ring), type: snap on, ... U-clamp.BEZEL MATERIAL:Steel black bezel, steel bezel, chrome plated bezel, brass bezel, steelroll ring (or bayonet threaded ring), type: snap on, ... 2.5%,1% accuracy, recalibrators,restrictors, special connections and more. Steel Ring General Gauge 5J2