29mm Single Fixed Carbo Block is great for the halyard on the Optimist. Use as the lower block with a piece of spectra line and a Harken hook in block. Description *Single / fixed *Sheave dia. (in) 1-1/8 *Length (in) 1-15/16 *Weight w/shackle (oz) 0.8 *Max. line dia. (in) 5/16 *Breaking strength (lb) 1000 Availability: Usually ships the next business day. H348Regular price: $12.60Sale price: $10.19 Due to the wide variety of the size and weight of our items we will charge the actual cost of shipping in a separate charge on all orders. Please email us for a shipping cost estimate. Shipments outside the USA may have add on fees and duties by your own government. Sailing can be green! See our recycle your old sail offer Send us email