Hardened drop forged steel SDS Max gouging chisel with shot blast finish. For drawing narrow channels in concrete and brick work. Can be used on all masonry, stone, brick and concrete. 18mm round shank. Compatible with all SDS Max machines. Hardened drop forged steel SDS Max gouging chisel with shot blast finish. For drawing narrow channels in concrete and brick work. Can be used on all masonry, stone, brick and concrete. 18mm round shank. Compatible with all SDS Max machines.