For multiple applications, sizes and hole enlargement in maintenance repair operations including electrical, plumbing / HVAC, metal working / fabrication, telephone and antenna cabling and electrical wiring redirection. Features special tip and step geometry for jam-free performance, with less risk of drill snagging when used with high speed cordless tools and also preventing deformation of the drilled material. Produced from custom-engineered steel with black oxide coating for up to 4 x longer life. Each step is relief-ground to drill and deburr automatically. Rapid Strike tip improves centering to allow fast drilling without the need to punch, and allows accurate start on contact without walking. Optimised 2-flute ground sharpened edge geometry provides fast and smooth cutting. Secure 3-flat grip prevents step drill from slipping in the chuck and ensures maximum transmission of torque. Also features laser-engraved size markings for best long term visibility. Ideal for drilling int...