A.G.O. Environmental produces several models of magnetic encoded sheave blocks based on commercial sheaves. The selection of the correct sheave is based upon the minimum bend diameter of your cable, which the running diameter of the sheave must exceed. Using a sheave with a running diameter smaller than your minimum bend diameter may cause premature wear of your cable.
For use with small diameter (nominally 1/8" / 3mm) wire line, we offer the PS06 magnetic encoded sheave block. Based on a commercial trolling block from Loomis Sales, this block is rated to a maximum breaking strength of 1500 pounds / 1134 kg with a running diameter of 6 inches / 15 cm. It can be used with wire line cables up to 1/4" in diameter.