This kit includes six individual center drill bits, offering excellent value for workshops, contractors, DIY enthusiasts, and anyone who frequently uses hole saws in their projects. The six drill bits ensure you have spares available if yours becomes dull or damaged, minimizing downtime during critical operations. Each drill bit is made from high-grade M2 ​​steel, a material specifically formulated for cutting applications requiring superior hardness, wear resistance, and the ability to maintain a sharp cutting edge at high temperatures. M2 steel is commonly used in industrial cutting tools because it maintains its hardness even when frictionally heated during drilling, preventing the premature dulling problems common in lower-grade carbon steels. These drill bits are coated with a titanium layer on the cutting surface using a physical vapor deposition process. This titanium coating has a wide range of benefits: it increases surface hardness beyond that of the M2 steel substrate; reduces friction between the drill and workpiece during cutting; prevents corrosion and oxidation; and helps prevent material from sticking or welding to the drill bit when drilling softer metals such as aluminum.