Size 0 20mm Plain Bearing Pulley Block Single Fixed Eye & BecketThe Barton Size 0 Plain bearing block has 20mm (3/4") sheaves and is also available in ball bearing sheaves. Designed for high strength and performance but lightweight with the range starting at only 13gms (0.5oz).Suitable for up to 6mm (1/4") rope Ideal for use on dinghies, day boats, and smaller craft or lead blocks, flag pennants, etc. on larger yachts. Quick Guide (pdf)