What are some common sizes of angle iron used in construction? Answer: Common sizes of angle iron used in construction typically range from 20mm x 20mm x 3mm to 200mm x 200mm x 25mm. These sizes can vary based on the manufacturer and specific application requirements. https://medium.com/@marketingsteel6/ms-tmt-bar-prices-an-in-depth-guide-to-cost-and-purchasing-strategies-b72b9457db5a