RWS makes it a "safe and secure fix" that is most important in functionality. Unlike the typical "quick release" that has over 80 years history, RWS uses a system that generates tightening torque through bolt connections on the lever and shaft. The handling of RWS is very simple. To tighten the lever clockwise by hand (min 15Nm hand force). Depending on the frame and fork structure, the lever can be flipped and closed by several times. Finally, the lever is in the perfect position. Φ0.2 inch (5 mm) shaft RWS that can be fixed more securely than quick release. Steel shaft: Compatible end width: 5.1 inches (130 mm); Weight: 1.8 oz (50 g); Product color may appear different from the actual product depending on your display settings. Product specifications, logo design, etc. may be subject to change for product improvement. We also cannot answer measurements or personal fit that the manufacturer does not announce.