Size 0 20mm Plain Bearing Pulley Block Double Fixed EyeThe Barton Size 0 Plain bearing block has 20mm (3/4") sheaves and is also available in ball bearing sheaves. They are 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 smaller craft or lead blocks, flag pennants, etc. on larger yachts. Quick Guide (pdf)