The Stanley PD45 Post Driver is a heavy duty tool for driving a wide range of posts including #2, #3, & #4 lb/ft “U” channel, #3 & #4 Strong Back “U” channel, #1 delineator, up to 2-5/8 inch round, or up to 2-1/2 inch square posts. Ideal fo for DOT applications to drive breakway post to within 4 inches above ground level.