6"/15cm through 15"/38cm panel clocks 12/24HR(PG52XX-CLOCK)6 ,9 , 12 and 15 analog panel board mounted clocks. Convex Glass Crystal. Available 12 hour prefix “PG or 24 hour prefix “M . 115VAC 60HZ synchronous movement. 230VAC and/or 50Hertz available. Designed for industrial control panel applications. Bottom knob for setting.