HARKEN 29 mm T2 Soft-Attach Block, 2146 Sailboat Blocks & Hardware_45 mm Element Double Block - Swivel They use a combination of

They use a combination of scientifically optimized block geometry

The injection-molded composite top plate provides superior impact and UV resistance

Plain bearing blocks are typically used for heavy and static loads in halyard tuning

ratchets and fiddles

The Harken 40mm Carbo Air® Single Block includes an integral becket that allows either a 2:1 or 3:1 purchase

HARKEN 29 mm T2 Soft-Attach Block, 2146 Sailboat Blocks & Hardware_45 mm Element Double Block - Swivel They use a combination ofHarken offers these patented, high strength, soft attach blocks in 29 to 57 mm sizes. They feature composite sheaves that spin freely on Delrin ball bearings with curved bearing races. They have no metal shackles or rivets, making them the lightest soft attach blocks Harken has ever designed. All T2 blocks are lashed or spliced through the load bearing center of the block, decreasing the loads on the side plates and acting as a safety backup for the