In this escapement, the escape wheel carries pins inserted into one or both sides of the rim and is usually made with the pallets dead-beat. The pallet arms are of different lengths when made to work with pins in only one side of the escape wheel. Although the layout is very different from the dead-beat escapement, the action is similar. The pinwheel escapement has the advantage that the pallets are always in tension, therefore wear in the pivot holes has less effect on timekeeping but, like the pin-pallet escapement, retention of oil on the pallets is poor, causing wear and inferior performance. This escapement is commonly found in good-quality French clocks made in the second half of the 18th century, and sometimes in English turret clocks.