Silver aluminum single pulley stationary truck assembly model OT35 for ground set flagpoles with a 3-1/2 inch top diameter. This cap style truck assembly has three set screws to secure it to the flagpole and a 1/2-13NC spindle thread to accept a top ornament with matching thread pattern. Maximum halyard diameter to use with this truck is 5/16. (Made in the U.S.A.)