Bosch 12 In. Tamper Plate Spade SDS-Max® Hammer Steel a reliable and durable solution for concrete and masonry drilling. Bosch provides a full assortment of SDS-max® hammer steel points and chisels designed to deliver increased efficiency and higher durability. Each chisel is crafted using Bosch’s proprietary heat-treat process, ensuring long-lasting performance and superior strength for demanding applications. Model Number: