This Twin wheel 100mm Automatic Guided Automobile (AGV) Castor has a bracket constructed from robust Cast steel that is zinc plated. There may be double thrust bearing within the swivel head to obtain a large load potential and keep castor performance and toughness..The shock absorbing pad made from a special http://castors08630.webdesign96.com/14155629/the-fact-about-castors-that-no-one-is-suggesting