Small white corrugated conical feed horn, round bolt-on flange (4 mounting holes), black cap/cover over the aperture. Partial stamped marking reads approximately "1101-40" -- could not identify manufacturer or exact part from this. Caliper measurements: flange bore ~10.45mm, OD ~44.88mm. Bore size is roughly consistent with K/Ka-band (~20-30 GHz) circular waveguide, but this is an inference, not confirmed -- please verify fit for your application before buying. Used condition, no history known, pulled from a shelf as part of a larger satellite/RF equipment surplus auction lot (same source as our other Skyware Global, GDST, and Hughes items). Sold as-is. Ships from Madison, North Carolina.