Fiddle blocks build simple three and four part purchases. Their large sheave/small configuration prevents line chafe and ensures a low friction tackle. Fiddle blocks come in a variety of configurations: these include fiddles with Hexaratchets and Cam-Matic cleats on adjustable arms. Add a 112 snap shackle for easy removal. 3/8 LINE, MWL 750#, BS 2500# WT. 11OZ