Industrial and scientific buyers beware – this spline shank falls short of expectations. Through trial and error, I found that this drill bit struggled to maintain the necessary power to handle tougher jobs .While the bit may be a bargain, the potential drawbacks could end up outweighing the savings..
When I first tried a 16" spline when drilling with a 3-1/2" bit , I noticed that the shaft was bent. even before I started drilling. I was at work and trying to finish before the inspector came, so I had to keep working. In short, check before use. Also. Delivery was on time .