DT Swiss Ratchet Freehub Body - Shimano Micro Spline Light Aluminum Sealed Bearing Kit w/ End Cap 12 x 142/148 mm. Ratchet freehub bodies have a gloss finish and dont 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.