RF50171HL%3A%20SERIES%2050%20HL%20BLOCK%20SINGLE%20UPRIGHT%20LEADNylatron%26reg%3B%20sheave%20suitable%20for%20use%20with%20wire%20rope.%0D%0ASPECIFICATIONS%0D%0A%0D%0ASheave%20diameter%20(mm)%2050%0D%0AB.L.%20(kg)%201500%0D%0AM.W.L.%20(kg)%20800%0D%0AMax.%20Rope%20diameter%20(mm)%2012%0D%0AWeight%20(g)%20115%0D%0AFastener%20%26Oslash%3B%20(mm)%206%0D%0A%0D%0APRODUCT%20INFORMATION%0D%0A%0D%0ALead%20blocks%20are%20a%20low%20profile%20solution%20for%20leading%20halyards%20or%20other%20rig%20sail%20controls%20back%20to%20cleats%20or%20jammers.