Diablo's SDS Plus Mortar Knives deliver extreme durability and stability when removing mortar in vertical joints of brick and block. A unique heat treatment process strengthens the steel body to withstand the stress of high-powered hammer drills and the impact of removing mortar. The precision plunge tip accurately plunges deep into mortar for superior efficiency. Featuring a sharp, straight edge, the tapered knife cuts away mortar with speed and ease. Optimized for maximum performance in corded and cordless SDS Plus rotary hammers