Allen 40mm Dynamic Blocks are built using a light weight composite cheek with a rope friendly, light weight stainless steel anchor strap and patented Allen Dynamic bearing system. The range features a large central hole, which provides great options for tie-on beckets and is available with a variety of accessories, making it the suitable choice for demanding applications. These include dinghy mainsheets, jib and spinnaker sheeting systems as well as keelboat control lines. Part No. Description Length, mm Line Dia., mm Break Load, kg. Weight, g AL-2040 Single 64 6 - 10 800 36.4 AL-2042 Double 84 6 - 10 1350 89