The 0431178181 from Fair-Rite Products is hinged (snap on) ferrite core with 160 Ohm @ 100MHz (impedance @ frequency). The 0431178181 has 0.169" (4.29mm) inner diameter and 0.465" W x 0.221" H (11.81mm x 5.61mm) outer dimension with length of 0.913" (23.19mm).