Augers… the heart of the digger Whether you need to drill holes for posts, tree plantings, structural support members or other tasks, Bush Hog® has a post hole digger to meet your needs. Our three 2400 Series models fit both Cat. 1 and Cat. 2 tractors. Augers are offered in both standard and heavy duty versions in sizes from 6 inches to 24 inches depending on digger model. Tough soil penetration is no problem for the powerful Bush Hog® post hole diggers.