Everything you need to know about the sda bolt
If you've spent any time around a heavy construction site or a tunneling project lately, you've probably heard someone mention the sda bolt and how much easier it makes the stabilization process. It's one of those tools that sounds a bit technical at first, but once you see it in action, you realize it's basically the Swiss Army knife of the drilling world. Instead of the old-school, multi-step process of drilling a hole, pulling out the drill string, and then trying to shove a bolt into a hole that might already be collapsing, the sda bolt does it all in one go. ...