Original T-A is an excellent choice for general purpose use. The design provides fast penetration rates that produce good hole size and finish. Standard geometry combines highly efficient and stable cutting action to minimize power consumption. Recommended for use in most steels, cast irons, high temperature alloys and aluminum alloys. Precision, performance and productivity are core features of Allied tooling and our commitment to innovation in all aspects of hole making technology means we continually set new industry standards in production efficiency and tool life.