Models Available: Depending upon the product weight and I-beam size, you can select the right Webb I beam trolley conveyor product for your needs: The model #9792 has 500 pounds capacity (1/4 ton) and suits 2-5/8″, 3″ and 4″ I-beams. Model # 10705 has 1,000 pounds capacity (1/2 ton) and suits 3″ and 4″ tall I