Metal security sleeve slip. Used to protect F-connectors on traps! ground blocks and converters from tampering. Ideal for use in schools, hospitals and hotels to protect equipment from tampering or accidental harm. Blocks connectors from open wrench access. High-impact nylon and cast steel for different levels of security (SS-1D). Long thread-on metal security sleeve is ideal for use with low profile inline filters and attenuators (SS-1DL). Used with ST-1P and ST-1PL 7/16 security shield tools.