For your PD-55 post driver
The PostMaster® Drive Kit is made to adapt the Rhino®
PD-55 Post Driver to drive the Master Halco® PostMaster
Plus® Series of Fence Posts. The kit includes a Post
Master® Adapter and a PostMaster® Slotted Chuck.
Rhino still carries the 4 lb Channel Post Adapter (P/N
070619) to drive the “Original PostMaster®” Post style. If
you are unsure which type of Master Halco® Post you are
using, visit masterhalco.com for more information.