These Tungsten Carbide Tipped (TCT) Holesaws are the ideal solution to your metal cutting needs. Designed for steel and stainless steel. For drilling stainless there is simply no alternative to TCT holesaws. They can also drill through wood, plastic, steel and many other materials. These are sold as full assembly so no arbour is needed. The handy spring built into the holesaw pilot ejects the core after drilling. Note: To extend the life of the holesaw it is important to use cutting lubricant or WD-40 while drilling. For maximum holesaw life use under 300 RPM when drilling stainless steel or steel.