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Jiffy Joist Hangers. WBP Hardwood Plywood. 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.
I already have a set of Bosch self cut bits but only up to 25mm. This expands the set and is of a quality which is consistent with the set and what you might expect of Bosch. I use it in a chuck in the tailpiece of my wood lathe to bore holes. It works well and gives a clean hole.
The drill itself is well made with a good cutting edge. The problem I found was the coarseness of the leading drill tip. It pulled the drill into the work too quickly to have proper control over the cutting of the main hole.