David Hon's redesign of the older, more complicated Campagnolo quick release design simplified production and lowered costs to the point that the quick release became economical enough to use on all bikes. He freely gave the redesign to the manufacturer of Dahon's quick releases and the bicycle world has never been the same since. Available in Silver or Black Sizes 32, 35, 39, and 40mm. DESIGN MAY NOT BE IDENTICAL TO THE PICTURE  - SUPPLIED IN SILVER   (39mm is used mainly on earlier steel small 16/20" wheel models)