Auger Screed Head can screed on Chaired Mesh, Chaired Rebar, Heat Tubes, some slab-on-deck and more. Raking/Fine Grade Head for raking concrete, finish grading or spreading material (sand, stone, etc.). Auto valve calibration for consistent, unsurpassed performance; Rotating head dollies (optional) Works well with slump as low as 3 ½" / 8.9 cm