Ratchet freehub bodies have a gloss finish and don&';t have a seal, as this is fixed on the hub shell. The Ratchet System was the first of this type for DT Swiss; used in the mid-range products like the 350 hubs. Includes end cap for 12 x 142 and 12 x 148mm hubs Fits Shimano 12-speed Micro Spline cassettes Crafted from lightweight aluminum Compatible with 12mm thru-axles Item Specifications Cassette Body Type Shimano Micro Spline keyword search Suggested Order Material Aluminum Rear Axle Type 12mm Thru-axle Rear Hub Spacing (mm) 142 Rear Hub Spacing (mm) 148