These are Ryan O dock rollers (http://www.dockrollers.com/rollers.html) which were used one season on a large Sea Ray. They are in great working condition, there is some rust on the metal part, but nothing that will disrupt the function.. I am selling them for $150 a pair of $400 for all six rollers. These are the old model, but brand new they are over $500 a pair brand new, so don't miss out on this great deal! the specs are: 2 rollers with pole mounting brackets measuring 4 feet tall, and 12.5 inches from the bracket to the outer edge of the roller. 2 rollers that are dock mount without brackets (which can be adapted to have brackets by welding brackets to the pole or they can be welded to the dock) measuring 4 feet tall and 9 inches to the outer edge of the roller. 2 rollers that are dock mount without brackets (which can be adapted to have brackets by welding brackets to the pole or they can be welded to the dock) measuring 4 feet tall and 6.5 inches to the outer edge of the roller. These can be arranged for pick up in Duck Creek, Grand Lake, or in Midtown, Tulsa Location: Grand Lake, or Tulsa it's NOT ok to contact this poster with services or other commercial interests oklahoma