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This 43-mix ferrite has found popularity in End-Fed Couplers as its size is ideal for use with a 100-watt transceiver. It can of course be used for HF Chokes if you prefer a smaller diameter core in a "taller" package. You can fit 4x turns of RG8-mini or 5x turns of RG58 coax through this. Note the core has a 16.7mm inner diameter!
For higher power, you can use a single (or stacked) FT240-43 or FT290-43 cores.
Need help choosing a ferrite? See our page on selecting the best size/type here.
Toroid sizes/types are easy to ID, the "150" translates to 1.5" (diameter) and the "43" is the ferrite mixture. As always, ratings need to factor in the aerial (SWR) match and duty-cycle.