Harken Sail Chafe Protectors, 102530 Speeds_1-Speed Zircon blocks are the most

Zircon blocks are the most efficient small boat blocks Harken has ever made

and combine with a proven bearing system to reduce friction

That's why Harken offers these easy conversion kits

even small yachts can now enjoy the convenience of raising sails or trimming genoas or mainsails at the touch of a button

Commonly 75mm blocks are for the main and spinnakers on larger FJs

Harken Sail Chafe Protectors, 102530 Speeds_1-Speed Zircon blocks are the mostHarken Sail Chafe Protectors are simple yet effective rigging accessories designed to protect sails from abrasion where they pass over wire rigging, shrouds, spreaders, or backstays. They consist of two interlocking halves that snap around standing rigging to create a smooth, low friction roller surface, helping headsails and mainsails glide past potential chafe points during tacks and gybes. By reducing wear on sailcloth and halyards, these