Drill pilot cobalt-steel 2-1/2" cutter & 4mm hex screw

Replacement pilot drill. Multiple tungsten carbide tips for long life and smooth cutting. Cut fast, accurate, high quality holes in stainless steel, copper, aluminium, steel. Flange stop prevents over-drilling. Replaceable cobalt steel pilot drill with split-point tip design to improve performance and resist walking. Eliminates need for centre punch. 2-1/2 inch cutter. 4 mm hex set screw.