The Barton Size 0 ball bearing block has 20mm (3/4") sheaves and is also available in plain 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