20mm Single block fixed eye. The Allen 20mm dynamic ball bearing block is simply the best designed and engineered micro block on the market. Line friendly soft contours and articulation, Stainless steel cheeks and inner bearing systems handle maximum loads, Central hole for tie-on becket. Perfect block to use on Laser outhaul linked with a carbine hook. Part Description Length  Line Diameter Breaking Load Weight AL-2020 Single Fixed Eye 37 2.5 - 6 540 10g