... brass bezel, steelroll ring (or bayonet threaded ring), type: snap on, roll ringTUBE&SOCKET: steel with nickel plated, phosphor ... brass bezel, steelroll ring (or bayonet threaded ring), type: snap on, roll ringTUBE&SOCKET: steel with nickel plated, phosphor ... (2-1-2%)OPTIONS&ACCESSORIES:Custom dial, metric scale, DIN 2.5%,1% accuracy, recalibrators,restrictors, special connections and more. Snap In ...