Mark 3 Asymmetric (MK3)
This double ended sleeve performs better because it only has two flat surfaces. The asymmetric design reduces the distance between the shaft and the swivel face. It is more stable square or feathered and positive in its movement, squaring and feathering. This asymmetric design is not recommended for use with the Magik or Martinoli swivels as these swivels produce excessive wear on the sleeves.