Looks like you are referring to high strength H steel piles of a specific size and weight. Here is a brief overview:
Huanggang Special Steel laser welds high-strength steel S690/S960 steel piles to provide the market with high-strength steel structural profiles.

Model: UBP305
Dimensions: 305mm x 305mm
Weight:
– 223 kg/m
– 283 kg/m

H-shaped steel piles are commonly used in deep foundations for buildings, bridges and other structures and have excellent load-bearing capacity and resistance to lateral forces.

High Strength: Suitable for heavy loads and challenging soil conditions.
Durability: Resistant to corrosion and environmental factors.
Versatility: Can be used in a variety of construction applications.