The Phoenix Contact ZB 6,LGS:FORTL.ZAHLEN 311-320 is a ZACK marker strip designed for clear and organized labeling in electrical installations. This particular marker strip features 10 sections, each labeled horizontally with consecutive numbers ranging from 311 to 320, printed in white for easy visibility. It is specifically sized to fit terminal blocks with a width of 6.2 mm, ensuring a precise and secure fit. Available through BSP Automation, this marker strip helps maintain neat and efficient wiring setups by providing consistent and durable identification.