Series 40 Ball Bearing Block- Double- Swivel Head

Series 40 Ball Bearing Block - Double - Swivel Head. Features: Low friction Acetal or Torlon bearing system. Lightweight. Cheek cut-outs for easy bearing maintenance. Features a swivel shackle head for full 360degrees rotation Sheaves running on Acetal or Torlon ball bearings provide high performance & low friction. The 2-stage ball bearing system provides consistent performance over the full load range.. Applications: Mainsheet. Halyard. Vang. Spinnaker control lines on off-the-beach catamarans, one design classes and sportsboats up to 8m (26ft).