Beam Trolley M 1 DB5766 Beam Trolley 5.5". Condition is "Used". Shipped with USPS Priority Mail. This auction is for a used beam trolley I've taken apart and cleaned up. All rollers turn freely. Only marking on this is the M in a hexagon with a number 1. And DB 5766. 5.5 in beam will fit in between. Hole is approximately 1.25 in. Albino brand or any other markings. Any questions let me know I'll try to answer. Thank you for looking.(116)(9)62021