Schaefer Fiddle Blocks are constructed with a large diameter single sheave and dual in-line sheaves with the ability to spread over-sized line over a greater surface. A high load design offers the ability to withstand the shock loads associated with Mainsheet and Boom Vang Systems. This powerful configuration prevents sheets from crossing and chafing and distributes load to three axles instead of the two seen in other block designs.

Mainsheet Systems: - For Boats up to 34'(10.3m)
Halyard Leads: For Boats up to 34' (10.3m)
Genoa Leads: For Boats up to 34' (10.3m)
Control Lines: For Boats up to 45' (13.7m)

SWL Aluminum/Stainless: 2250 lbs. (1020 kg)
SWL Ball Bearings: 1700 lbs. (771 kg)

Safe Working Load (SWL) denotes the amount of load each block and its components can handle without breaking. It is based on three factors: the line load, angle of the the load turning through the block, and the amount of purchase involved in the system.