BrushCutting, Thinning, Shredding, and Crushing Attachments. Slashbuster HD 422 Head (Slashbuster comes in many sizes and models, 36 in to 48 in, mini to heavyduty, with and without third boom and grapple; HD 422 was chosen as a representative model) DM Machine Division, Inc. Contact DM Machine Division, Inc.