WALTER 05A992 - SST Core Cut Annular Cutter SetSuper Speed Tip (SST) Core Cutters are made with state of the art surface treatment technology that removes porosity during the fabrication process. This creates a perfectly smooth finish which allows for a better evacuation of material while drilling. It also helps to improve product life and reduce drilling time as it decreases friction with the work surface, which in turn reduces the amount of heat generated. Includes 9 16" SST Core Cut Annular