Weiler 12″ Cable Twist Knot Wire Wheel Brush features heavy-duty construction and an extra long trim length for cleaning expansion joints and cracks in concrete and asphalt. 1″ arbor hole for use on walk behind machines. Heavy duty construction and an extra-long trim length for cleaning expansion joints and cracks in concrete and asphalt. For use on walk behind machines. Knot wire wheels with an arbor hole are intended for use on straight grinders and stationary machines such as bench or pedestal grinders and buffing lathes. Featuring Weiler’s individual knot hole construction, these radial brushes are available in heat-treated steel, type 302 stainless steel and bronze wire for use in a wide variety of applications. .