#drill collars

That tape mark vanished after just a few holes. Now anchors sit proud or don’t seat right—more cleanup, lost time. Switch to a depth collar—every hole hits flush, even when dust chokes the view. Switching to a depth collar keeps your holes clean and flush, even when dust clouds the view. Makes a difference when you're aiming for accuracy. Check it out at http://www.gumboll.myshopify.com

https://www.dic-oiltools.com/drill-collar.php