30mm Monoblock Dynamic pulley. 30mm Single block fork head. - - SINGLE WITH FORK A2031F 30mm Single block fork head. With the Allen dynamic ball bearing technology at the heart of this block, the line friendly soft contours allowing articulation and stainless steel cheeks, the 30mm dynamic block will easily handle maximum loads and give unrivalled performance. Line friendly soft contours and articulation, Stainless steel cheeks and inner bearing systems handle maximum loads, Central hole for tie - on becket. Length Line Dia. Shackle Pin Break Max Dynamic Weight mm mm mm Load Kg. Load gm 68 05 - 08 4 450 140 36 Technical documents can be downloaded here