Drill hole cleaning steel brush is an important part for chemical anchor installation. It is commonly used with a blow off pump. After drilling, using the appropriate size brush, insert the brush into the bottom of the hole using a twist / twist and push / pull motion to remove additional dust and debris. Clean the drilled holes properly to ensure that both the chemical anchor and the rods, rods, bolts and screws are working well to provide high bond strength. Good Use Hardware offers 6 different sizes of steel brush for your selection.