For External Halyard Flagpoles.
Know the diameter of your halyard when ordering. If the diameter is too big for the pulley it will fray pretty fast. 1/4", 5/16" or 3/8"
Non-wire center - recommended for any use
Wire Center - This is mainly used if you have theft problems. It also holds up better in windy areas.
1/4" Halyard Spools are only available in 1,000 ft spools.
5/16" and 3/8" are only available in 500 ft spools.