The PHOENIX CONTACT STP 5-2 is a versatile double marker carrier designed to snap onto the double-level spring-cage terminal block models STTB 2,5 - STTB 4 - PTTB 2,5 - PTTB 4. This marker carrier offers a convenient way to label and organize your terminal blocks. It is compatible with the UC-TM 5 - ZB 5 or UC-TMF 5 - ZBF 5 marking materials, making it easy to create clear and visible labeling for your electrical connections. With its durable construction and easy installation, the PHOENIX CONTACT STP 5-2 is an essential accessory for any professional electrical installation.