Fair-Rite 0431164181 Ferrite Clamp On bead, 43 material, suitable for clamping over cables up to 13.05mm diameter for RF suppression between 1 and 300MHz.  These are very effective at suppressing common mode noise in the 1 to 30MHz region if the cable to be suppressed can be wound through the core a number of times.  Ideal for use on RG8, RG213, and 400 series cables.

Fair-rite PN# 0431164181, These are also known as a 2X31-181P2 by other suppliers.  32.5mm L x 29mm W, 14.6mm H, ( inside diameter 13.05mm ) For more information see the Fair-rite 0431164181 Data Sheet

We can generally supply these in higher quantities than stocked in around 2 weeks POA