HARKEN 29 mm Carbo Clew Block, 371 Track Length_1.8 m (5.90 ft) 16 mm sheaves are Delrin

16 mm sheaves are Delrin and feature stainless ball bearings that ride in a grooved race

The line stays exactly where you want it as the smooth teeth grip line of all sizes

5 series blocks are offered with Aluminum cheeks and plain bearing sheaves (504 series)

Their entire line of products

HARKEN 29 mm Carbo Clew Block, 371 Track Length_1.8 m (5.90 ft) 16 mm sheaves are DelrinThese smooth running powerful performers make trimming easy, no matter how hard the wind blows. Carbo Air blocks are made of tough reinforced composite in size and style to fit any system: singles, doubles, triples, quads, and quints; ratchets and fiddles; soft and hard attach; 18 75 mm. Perfect for main, jib, and spinnaker sheets on dinghies and sport boats; control lines on boats of all sizes. Harken's 29mm Carbo Blocks are great for use as a