This is a wonderful mainsheet block that automatically engages the ratchet when the tension on the line is high enough then auto disengages for easy pay out of the sheet at the windward mark. You can adjust the tension with the included allen wrench. Is your ratchet on or off? That is one less thing to think about on the water! Sheave dia. (in) 2-1/4 Length (in) 4-1/16 Weight (oz) 3.7 Max. line dia. (in) 3/8 Shackle pin dia. (in) 3/16 SWL (lb) 500 Breaking strength (lb) 2000 Holding power w/180 degree wrap 50 lb (23 kg) 10:1 Availability: Usually ships the next business day. 2625Regular price: $86.15Sale price: $73.23 Harken Stand up Spring for Dinghy Main Sheet Blocks2" X 7/8" Spring works for the Main sheet blocks on the Laser®, Sunfish®, Otimist and many other small dinghy main sheet blocks. Availability: Usually ships the next business day. H071Regular price: $0.95Sale price: $0.81 Harken Stand Up Boot Made of durable flexible PVC, stand-up boots hold blocks up without snagging lines. The 370 fits up to 75 mm blocks. Availability: Usually ships the next business day. H370Regular price: $11.50Sale price: $9.78 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