Ferrite Toroid, Mix 43, Fair-rite p/n 2643251002
39mm (1.5") OD, 16.75mm (0.66") ID, 22mm (0.875") H
Weight: 104g
Increasingly popular for HF EFHW matching as a substitute for the FT-240-43. The comparatively larger cross sectional area and shorter path length appear to provide an advantage.