EasyRoll Square Expanding Adaptor | AIMS Industrial

From the Manufacturer

High quality injection moulded nylon expanding adaptor suits 22mm internal diameter square tubing. Used in conjunction with bolt hole castors, the adaptor screws onto the threaded bolt protruding from the top of the castor. Insert into the tubing and turn the bolt to compress the adaptor, locking it firmly in place. A low cost and reliable way of fitting castors to tubing, ideal for light duty trolleys and tube framed equipment.