Axle Release Pro Quick Release Adapter Convert any solid axle bicycle hub to a quick release hub in seconds! Simply remove the axle nuts and replace with these two devices! Makes wheel removal safe and easy! Great for flat tire repair or wheel removal for transport in or on vehicles. Equipped for most common axle size: 3/8" diameter axle, 26 threads per inch (3/8"x26T). Conversion kits available for other sizes-see ARCN3824 (3/8"x24T) or ARCNM10 (Metric-M10x1.0) Safest quick release system on the market with two (2) independent cams that ensure a secure connection everytime.