I am using it for drilling a small truck loading platform. I think that it is more durable than other products. I think that it is better to use hole penetration of the insulation panel by penetrating.
I used it for making a wood deck. I do not know if there was a problem with how to use, but when I was drilling in 3 cm thick hardwood (ulin), I broke from the root in one day. I planned to have 12 holes in all, but since I broke at the stage where I opened 11, the timing was bad and regrettable. I was satisfied if I left one more place. If you rotate it in the reverse direction to remove it in the middle of the drilling work, the part of the tooth and the root part were disengaged, so it would be good if only the root part could be replaced.