Durable split bit for fast and precise material penetration. The patented split step design optimizes chip loading for a fast, smooth cut and more holes per charge. The progressive cutting edges provide the tool accessory with balanced aggressiveness to maximize torque efficiency and minimize jamming. The double-flute design provides superior chip evacuation, cutting speeds, and tool life. Three-flat shank fits all 1/2-inch drill chucks. Laser-etched markings for quick and easy product and size identification. Replaced 30005 Features Type: Multi-hole step cutter Application: Cuts mild steel, aluminum, brass, copper, wood, fiberglass, plastics, and laminates Number of drilling steps: 10 Minimum drilling diameter: 3/16 in. (4.8 mm) Maximum drilling diameter: 3/4 in. (19.1 mm) Maximum sheet metal thickness: 10 gauge (3.5 mm)