28mm/30mm Universal Tire Changer Nylon Mount / Demount Duckhead Plastic Head Complete SetApplication: This head is suitable for both swing arm tire changer and tilt back tire changer, it has flat contact surface design so head can tilt back smoothly.: Its made of high-strength nylon which is durable enough to withstand the bead stress of run-flat and low profile tires.Easy to use: This is a great alternative to metal duckhead and replacement work is easy to do.Function: Its suggested to use plastic heads in tire changing because it is much safer for delicate and expensive wheels and prevent any damage to tire and rim.Reminder:Here is reminder: The mounting brackets normally have two dimensions, 28mm and 30mm. Measure the Hex bar end that the head attaches to and get the correct dimension. We have listings for both specifications.Customer service: Customer satisfaction is incredibly important to us, we hope the information is clear but if you have any doubt do not hesitate to . Our service team will answer your requests within 2 hours. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.