What is a fid primarily used for?

A fid is primarily used as a tapered wood tool that assists in splicing lines, which involves joining two lengths of rope or line together. This task is often performed in maritime settings where strong and reliable connections between ropes are essential for safety and functionality on a ship. The fid, when inserted into a line, creates space for the strands of the rope to be manipulated and interwoven with another piece, allowing for a secure splice.

Other options refer to different nautical tools or materials. The method of securing sails typically involves various knots and rigging techniques, while heavy cables are often used for mooring or anchoring rather than for splicing. A loop of synthetic line could refer to a variety of applications, but it does not describe the specific function or structure of a fid. Thus, the primary role of a fid in splicing emphasizes its importance in creating strong, permanent joins in ropework.