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 in round, or up to 2-1/2 in square posts. Ideal for DOT applications to drive breakway post to within 4 inches above ground level.