Silver Cast Aluminum truck.  Fits pole diameter of 2".  For external halyard poles, this stationary cap-style truck is easy to install and works on most standard residential in-ground poles.  The single pulley is cast nylon an a 1/4" stainless steel axel, recommened halyard is 1/4" diameter but can hold up to 5/16".  Secured to the pole by a stainless steel set screw on the side.  Can accept top oranments with a spindle threading of 1/2" (secured by one stainless steel pan head screw- size 10-32).