A Flap disc in an amazingly multipurpose abrasive disc that's long lasting, very affordable, and out there in many models to suit various tools. Abrasive flaps are installed, overlapping each other, to your center hub. Enerpac is a world leader in high stress hydraulic tools, controlled drive products and alternatives https://www.hukums.com/products/elephant-air-impact-wrench-15-iw05s