Full Thread Hex Bolts with Hex Nuts — looks like heavy duty structural bolts.
Details from the photo:
Type: Fully threaded hex bolts + matching hex nuts
Finish: Yellow Zinc / Gold Passivated coating. That’s for rust/corrosion resistance
Head: Hex head on bolt, hex nuts both sides
Size: Looks like M16 - M20 range, long length. Common for structural and flange work
Grade: The yellow finish + thick shank suggests Grade 8.8 or higher structural grade
What they’re used for:
Steel Structures - Buildings, bridges, towers
Flange Connections - Pipelines, tanks, pumps, especially oil & gas
Machinery Mounting - Generators, heavy equipment, rigs
Construction - Anywhere you need through-bolting with nuts both ends
The yellow zinc plating makes them good for outdoor and industrial use. Less rust than plain black bolts.