HI28B2038 - 

High Impedance Sleeve Snap with Optional Mounting Bases
High impedance ferrite assembly for large scale applications containing high data rates and microprocessor harmonics/spurious signals well beyond the operating frequency. Excellent for telecommunications switching applications, local area networks (LANs) and distribution system integration. The basic version simply clamps into position around cables and wiring. May also be mounted with a flat-head screw through the 0.120" (3.0 mm) diameter hole in the bottom by temporarily removing lower ferrite half.
Other mounting options include a foam adhesive base, a button mount base sized for a 0.150" (3.8 mm) diameter hole, and a hardware mounting plate for screw or rivet attachment. The adhesive mount base and button mount base options are preassembled. The hardware mounting base may be press-fitted into the receptacle on the bottom of the case during installation in one of four positions at 90° increments for alternative assembly configurations.