The SelfCut Speed Spade Bit performs extremely fast hole drilling. Its self-feeding threaded tip enables the drill bit to effortlessly pull itself into the wood for high-speed drilling with little exertion. Fast chip removal for rapid results is made possible by the specially shaped spade. In product tests, this drill bit produces holes 10 times faster than a standard spade bit. It is suitable for use on soft and hard wood, light building materials and plasterboard. This spade bit has a 1/4" hex shank system and it is best for use with portable power drills.
Materials
These are the best self cutting spade bit i have ever came across since I worked with wood. Especially when am mortising for door locks. It takes less time and they very easy and effective to use, Well done Bosch for maintaining consistancy in making quality tools.