This high quality, SDS-max, 9 in tamper plate spade works with the HS1828 tamper plate and the HS1969 carbide bushing tool. All Bosch chisels are manufactured with a proprietary heat treat process. Bosch offers a full assortment of SDS-max hammer steel points and chisels. Bosch brings constant innovation to concrete and masonry drilling with increased efficiency and higher durability.