This tamper plate makes short work of flattening ground surface, and it combines with a tamper plate shank for tough hammer steel. It works with a variety of hammer shank systems - SDS-max, spline/round hex and 3/4 in hex. All Bosch chisels are manufactured with a proprietary heat-treat process. Bosch offers a full assortment of hammer steel points and chisels. Bosch brings constant innovation to concrete and masonry drilling with increased efficiency and higher durability.